Apple allows organizations to control access to supported iCloud services when users authenticate with Managed Apple Accounts. Current Apple deployment documentation identifies iCloud Backup as one of the services available in supported Managed Apple Account enrollment scenarios and states that organizations can control access to individual iCloud services through Apple Business Manager or Apple School Manager.
Therefore, option B is correct. iCloud Backup can be used with a Managed Apple Account in supported deployment models, including account-driven Device Enrollment and User Enrollment. Family Sharing and personal Health data are not organizational iCloud-management features for Managed Apple Accounts, and Safari extension synchronization does not represent the managed iCloud backup capability described here.
This separation allows organizations to manage work-related cloud services while maintaining appropriate boundaries between organizational and personal services.

Explanation:
From the sidebar, click Privacy & Security. Scroll down, click Lockdown Mode, then click Turn On.
https://support.apple.com/en-us/105120#:~:text=From%20the%20sidebar%2C%20click%20Privacy,Mode%
2C%20then%20click%20Turn%20On.

AirDrop requires both Wi-Fi and Bluetooth. IfBluetooth is off, AirDrop fails as it can't discover nearby devices.
* Option B: AirDrop is built-in, not installed.
* Option C: Handoff doesn't disable AirDrop.
* Option D: Hotspot doesn't affect AirDrop.
* Option A: Correct-Bluetooth is essential.References: Apple Support - "Use AirDrop" (support.apple.
com/HT204144).

According to the Apple Device Support Reference Materials, the steps to put an iPhone in recovery mode are:
* Plug your iPhone in to your computer using your USB to Lightning cable1.
* On a Mac with macOS Catalina or later, open the Finder. On a Mac with macOS Mojave or earlier, or on a PC, open iTunes1.
* Quickly press and release the Volume Up button, then quickly press and release the Volume Down
* button, and then press and hold the Side (or Power) button until the recovery mode screen pops up12. It won't happen instantly, so hang on for at least 15 seconds or so before you try it again2.
* Locate your device on your computer and choose the option to Update or Restore1.
These steps apply to all iPhones manufactured since 2017, including iPhone 8 or later, iPhone SE (2nd and 3rd generations), and iPhone 12 or later2. For older models, such as iPhone 7 or earlier, the steps may vary slightly1. References: 1: If you can't update or restore your iPhone or iPod touch - Apple Support 2: How to put your iPhone or iPad into recovery mode | iMore