The correct answer is B. exFAT, because exFAT (Extended File Allocation Table) is designed to provide cross-platform compatibility between Windows and macOS while supporting large files and large storage devices. When an external hard drive must be readable and writable by both operating systems without additional drivers or configuration, exFAT is the preferred choice.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, exFAT was developed to overcome the limitations of FAT32, such as file size and volume size restrictions, while maintaining broad operating system support. Both Windows and macOS include native support for exFAT, making it ideal for removable storage devices.
The Travis Everett & Andrew Hutz - CompTIA A+ All-in-One Exam Guide explains that NTFS is fully supported on Windows but only has limited or read-only support on macOS by default. APFS is Apple's proprietary filesystem and is not natively supported by Windows. XFS is a Linux filesystem and is incompatible with both Windows and macOS without third-party tools.
The Mike Meyers / Mark Soper Lab Manual reinforces that for external drives shared across platforms, exFAT offers the best balance of compatibility, performance, and simplicity.
Therefore, exFAT is the best filesystem choice, making B the correct answer.

To prevent unauthorized physical access to a mobile device, the company must ensure the device locks quickly and requires an authentication factor before anyone can use it. PIN authentication directly blocks access by requiring a passcode to unlock the device-Quentin Docter lists PIN lock as one of the primary
"screen lock" methods used to secure mobile devices, explaining it as the most common unlock method (typically 4-6 digits, sometimes alphanumeric).
Screen timeout (auto-lock) reduces the window in which an unattended phone remains usable; the All-in-One guide notes that systems can be set to an automatic timeout and screen lock, requiring credentials after a short period of inactivity. Mike Meyers' Lab Manual reinforces that you should "protect your data from access by putting a good screen lock on the device," and that these locks commonly require a password/PIN/pattern
/biometric to regain access after locking.
Hotspots, VPN, antivirus, and location services are valuable, but they do not primarily stop someone holding the device from opening it and accessing data.
References: Quentin Docter - CompTIA A+ Complete Study Guide (Mobile Device Security: Screen Locks
/PIN lock); Travis Everett & Andrew Hutz - CompTIA A+ All-in-One Exam Guide (automatic timeout
/screen lock); Mark Soper - Mike Meyers' A+ Lab Manual (screen lock methods protect data from access).

Comprehensive and Detailed Explanation From Exact Extract:
The symptoms suggest abrowser hijacker. Thefirst stepsshould be toremove any malicious extensionsandreset the startup pageto restore normal behavior.
FromAll-in-One Exam Guide:
"Browser hijackers often install as extensions and change homepage settings. Removing these extensions and resetting the startup configuration typically resolves the issue."

Comprehensive and Detailed Explanation From Exact Extract:
Keychainis the built-in macOS utility that manages and stores credentials, including passwords and certificates.
According toQuentin Docter - CompTIA A+ Complete Study Guide:
"Keychain Access in macOS is used for managing and storing passwords securely, similar to credential managers in Windows."