Marketing Cloud authenticates several factors during user login, among which:
* Whitelisted IP address check: Marketing Cloud checks if the user's IP address matches those listed in the IP whitelist settings. This is part of the security measures to ensure that only authorized accesses are allowed from secured locations.

For NTO to format links for Google Analytics 360 without including PII, they should use non-personally identifiable information in the query string parameters. Suitable options include:
* A. Product Code: Identifies a product without revealing customer identity.
* B. Application ID: An internal reference that does not disclose personal details.
* C. Subscriber ID: A unique identifier for a subscriber that is not directly tied to personal details like an email or name.

When enabling Multi-Org in Marketing Cloud Connect, it's important to consider:
* The Multi-Org configuration does not support using a standard profile and preference center across connected business units. Each business unit operates independently.
* Admins must consider alternative strategies for managing subscriber preferences across multiple Salesforce orgs linked to different business units in Marketing Cloud.

When a File Transfer Activity is used to decrypt an encrypted file on Marketing Cloud's SFTP, the decrypted data is temporarily stored in the Safehouse. The Safehouse is a secure data storage location within Marketing Cloud used for temporary storage during file processing tasks, such as decryption, before the data is moved to its final destination, like a data extension.

To create a suppression list for hard-bounced email addresses, the most direct approach is to query the Bounce Data View in SQL. This Data View contains all bounce-related information, allowing admins to specifically filter for hard bounces by the bounce category. Using a query activity, the admin can extract all hard bounce records and create a dynamic or static suppression list based on these results. This method is efficient and ensures that only relevant data is included in the suppression list.