Multi-Factor Authentication (MFA) requires at least two different types of authentication factors:
Something you know (e.g., password or PIN)
Something you have (e.g., smartphone or hardware token)
Something you are (e.g., fingerprint or facial recognition)
Option A, sending a code to the user's phone, is an example of " something you have " - a physical device that receives a one-time passcode. Combined with a password, this forms a proper MFA implementation.
B). Date of birth is another knowledge-based factor (like a password), not a second factor type.
C). Solving a math problem is not a recognized authentication factor.
D). A PIN is also " something you know " and does not count as a distinct MFA factor when paired with a password.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast common security measures and authentication technologies.
Study Guide Section: Authentication factors - password, biometrics, tokens, MFA

BSOD after driver installation suggests a compatibility issue.Safe Mode allows rollback of driversthat may be causing the crash.
FromTravis Everett - CompTIA A+ All-in-One Exam Guide:
"If a BSOD occurs after a driver update, boot into Safe Mode and roll back to the previous driver version to restore system stability."

If internal resources (such as intranet or internal apps) can ' t be accessed but external sites work, this often points to aDNS issue, where the system isn ' t resolving internal domain names correctly.
FromAll-in-One Exam Guide:
"When internet access is functional but internal sites fail to load, the issue usually lies with DNS resolution.
Internal resources often require internal DNS servers, which may not be configured correctly."

The correct answers are E. Set the view extensions to " on " and F. Check the box to view hidden files, because folders located in the root directory are often hidden or protected system folders by default in Windows operating systems. Windows hides certain files and folders to prevent accidental modification or deletion, especially those critical to system functionality.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, File Explorer includes view options that control whether hidden files, protected operating system files, and file extensions are visible. If these options are disabled, users will not see many system-level folders, even when browsing the root of the drive (such as C:\).
The Travis Everett & Andrew Hutz - CompTIA A+ All-in-One Exam Guide explains that enabling "Show hidden files, folders, and drives" allows technicians to view directories that are normally concealed, such as configuration or application folders. Additionally, turning on file name extensions helps identify system folders and files more accurately, especially when troubleshooting or guiding users remotely.
The Mike Meyers / Mark Soper Lab Manual reinforces that simply opening File Explorer or adjusting display resolution does not affect file visibility. The correct fix is to modify File Explorer view settings, specifically enabling hidden items and file extensions.
Therefore, enabling hidden files and file extensions is required, making E and F the correct answers.

Virtualization settings are typically found within the BIOS/UEFI firmware configuration. To prevent unauthorized users from changing these settings, the technician should set a BIOS password. This ensures only administrators with the password can access or modify BIOS settings, including virtualization support.
B). The guest account is a user-level feature in Windows and doesn't control BIOS access.
C). A screen lock prevents casual access to the desktop but doesn't protect firmware settings.
D). AutoRun controls how media and devices behave when inserted - unrelated to BIOS security.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast security measures and administrative controls.
Study Guide Section: BIOS/UEFI settings protection - password implementation
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