Using bootable antivirus media to scan the system is an effective method for removing a persistent virus.
Booting from external antivirus media allows the system to scan for and remove malware without the infected operating system running, which can prevent the virus from hiding or resisting removal efforts that might occur within the active OS environment.

The correct answer is A. Document the date and time of change. After implementing a change, the technician should document the date and time of change in the change log or record. This helps to track the change history, monitor the change performance, and identify any issues or incidents related to the change.
Documenting the date and time of change is also a good practice for auditing and compliance purposes.
Documenting the purpose of the change (B) and the risk level are steps that should be done before implementing the change, not after. These are important information that help to justify, prioritize, and plan the change. The purpose of the change should explain why the change is needed and what benefits it will bring to the organization. The risk level should assess the potential impact and probability of the change causing any problems or disruptions to the business.
Documenting the findings of the sandbox test (D) is also a step that should be done before implementing the change, not after. A sandbox test is a way of testing the change in an isolated environment that mimics the production environment. This helps to verify that the change works as expected and does not cause any errors or conflicts with other systems or processes. The findings of the sandbox test should be documented and reviewed by the change advisory board (CAB) before approving the change for implementation.
References:
What is a Change Advisory Board? (Overview, Roles, and Responsibilities) Best Practices in Change Management
10 Top change management best practices

For securing mobile devices with two authentication methods, combining something the user knows (a PIN) with something the user is (biometrics) enhances security by implementing multi-factor authentication.
* Smart card: Generally requires additional hardware and is not commonly used in mobile devices.
* Biometrics: Uses unique biological traits such as fingerprints or facial recognition, providing a convenient and secure second method of authentication.
* Hard token: Involves additional physical devices which might not be practical for mobile devices.
* One-time password: Usually used for specific applications rather than as a general device authentication method.
Reference: CompTIA A+ Exam Objectives [220-1102] - 2.1: Summarize various security measures and their purposes.

A workgroup network is a peer-to-peer network where each PC can share files and resources with other PCs without a central server. A public network is a network that is accessible to anyone on the internet. A wide area network is a network that spans a large geographic area, such as a country or a continent. A domain network is a network where a server controls the access and security of the PCs. Verified References:
https://www.comptia.org/blog/network-typeshttps://www.comptia.org/certifications/a

Time drift occurs when the internal clock of a computer is not properly synchronized, often leading to discrepancies like being an hour behind. In this case, the workstation is the only device affected, indicating that it's likely a local issue. Time drift can happen if the system clock isn't syncing properly with an NTP (Network Time Protocol) server or if automatic daylight savings adjustments aren't enabled. It's less likely to be a CMOS battery issue since the technician has already verified the correct date and the system clock isn't completely reset (which is what happens when the CMOS battery fails).
References:
Troubleshooting Time Synchronization Issues in Windows (Help Desk Geek) (Zendesk)