BitLocker is a full-volume encryption feature built into certain editions of Windows that protects entire drives. EFS is another Windows feature that encrypts individual files or folders stored on NTFS volumes. It is not available on Linux or macOS. Options B-D are incorrect because they either reverse the scope (file- vs. disk-level), assign the technologies to non-Windows operating systems, or specify unsupported file systems.
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What is Bitlocker?
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What is EFS (Encrypting File System)?
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Are there comparable encryption solutions for Linux and Mac?