According to the ACAMS Study Guide 6th Edition, Chapter 2, page 36, one of the methods that financial institutions can use to identify suspicious or unusual activity is to monitor transactions for red flags or indicators of money laundering or terrorist financing. Some of the common red flags are:
Transactions that are inconsistent with the customer's profile, business, or source of funds Transactions that involve high-risk countries or jurisdictions, especially those with weak or inadequate anti-money laundering regulations, or those known to be sources or destinations of illicit funds Transactions that involve the use of complex or unusual financial instruments or structures, such as multiple accounts, intermediaries, or offshore entities, that have no apparent economic or lawful purpose Transactions that involve the use of large amounts of cash, checks, or monetary instruments, especially if they are structured or aggregated to avoid reporting or recordkeeping requirements Transactions that involve the use of third parties or nominees, such as relatives, associates, or shell companies, to conceal the identity, ownership, or control of the funds or assets Option B is a transaction type that warrants investigation, as it involves sending large number of high dollar international wires to different countries, which could indicate that the customer is involved in layering or integration stages of money laundering, where the illicit funds are moved across borders and disguised as legitimate transfers. This transaction type also raises the risk of exposure to sanctions, terrorist financing, or other illicit activities, depending on the destination and purpose of the wires.
Option D is also a transaction type that warrants investigation, as it involves depositing a lot of checks drawn on banks in foreign countries, which could indicate that the customer is involved in placement or layering stages of money laundering, where the illicit funds are introduced into the financial system or converted into other forms of value. This transaction type also raises the risk of exposure to fraud, counterfeit, or forgery, depending on the origin and authenticity of the checks.
Option A is not a transaction type that warrants investigation, as it involves making regular cash deposits of a few hundred dollars every few days, which could be consistent with the customer's profile, business, or source of funds, especially if the customer is an ice cream vendor who operates in cash. This transaction type does not raise any red flags of money laundering or terrorist financing, unless there is evidence that the cash deposits are structured or aggregated to avoid reporting or recordkeeping requirements.
Option C is also not a transaction type that warrants investigation, as it involves writing multiple checks for a few hundred dollars to the same dozen payees every two weeks, which could be consistent with the customer's profile, business, or source of funds, especially if the payees are suppliers, employees, or contractors of the customer. This transaction type does not raise any red flags of money laundering or terrorist financing, unless there is evidence that the checks are used to facilitate illicit activities, such as bribery, kickbacks, or tax evasion.
Reference:
ACAMS Study Guide 6th Edition, Chapter 2, page 36
Red Flags And Atypical Customer Behavior: Anti-Money Laundering Awareness
4 Red Flags of Money Laundering or Terrorist Financing

The Basel Committee on Banking Supervision (BCBS) is a global standard-setting body for the prudential regulation of banks. It does not have any formal authority to enforce its standards, but relies on its members' commitment and peer pressure to implement them. The BCBS's principles on customer due diligence (CDD) are part of its guidelines on anti-money laundering and combating the financing of terrorism (AML/CFT), which aim to enhance the soundness and integrity of banking systems. The BCBS's principles on CDD provide guidance to banks and bank supervisors on the essential elements of a CDD programme, such as customer acceptance, identification, verification, risk assessment, monitoring, and record-keeping. The BCBS's principles on CDD are not legally binding, but are intended to be a benchmark for national practices and for banks to design their own policies and procedures. The BCBS's principles on CDD are consistent with the recommendations of the Financial Action Task Force (FATF), the global standard-setter for AML/CFT.
Reference:
Customer due diligence for banks 1, BCBS, October 2001.
The Basel Committee on Banking Supervision report on customer due diligence 2, Journal of Banking Regulation, 2002.

According to section 312 of the USA PATRIOT Act, U.S. financial institutions that maintain correspondent accounts for foreign financial institutions must apply due diligence to such accounts. The due diligence must include obtaining information relating to the foreign bank's anti-money laundering program, as well as the identity of any person who owns 10% or more of the foreign bank, unless the foreign bank is publicly traded. These requirements are intended to prevent the use of correspondent accounts by foreign shell banks or other entities that may pose a high risk of money laundering or terrorist financing.
Reference:
USA PATRIOT Act | FinCEN.gov
FACT SHEET for Section 312 of the USA PATRIOT Act Final Regulation and Notice of Proposed Rulemaking | FinCEN.gov US PATRIOT ACT | State Street CAMS Exam: USA PATRIOT Act Requirements for Opening a Correspondent Account

A fundraising organization is a type of non-profit organization that may be vulnerable to money laundering and terrorist financing risks, as they often operate in high-risk areas, deal with large amounts of cash, and have complex and opaque structures. Therefore, a fundraising organization warrants enhanced due diligence, which is a higher level of customer verification and monitoring that goes beyond the standard customer due diligence measures. Enhanced due diligence may include obtaining additional information on the source of funds, the purpose of the relationship, the beneficiaries, and the governance of the organization.
Reference:
ACAMS Study Guide for the CAMS Certification Examination, 6th Edition, Chapter 2: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT), Section 2.2: Customer Due Diligence, p. 33-34 Anti-money laundering - a guide to customer due diligence Customer due diligence | The Law Society

Physical certificates are documents that represent ownership of securities, such as stocks or bonds, that are issued by a company or a government. Physical certificates present a money laundering risk to broker-dealers for two reasons:
The trade information on a physical certificate can be easily altered, such as the name of the owner, the date of issuance, or the number of shares. This can facilitate the concealment or falsification of the origin, ownership, or value of the securities, and enable the laundering of illicit funds through the purchase or sale of the securities.
Physical certificates may be provided to nominees for deposit or settled in off-market transactions, such as private placements, bearer bonds, or direct transfers. This can bypass the normal reporting or recordkeeping requirements of the broker-dealer, and avoid the scrutiny or verification of the identity, source of funds, or beneficial ownership of the securities.
Reference:
Two Reasons Physical Certificates Pose Money Laundering Risks to Broker ...
CAMS Certifications: How to Get CAMS Certified | ACAMS
ACAMS Online Certificates | ACAMS