Which Windows feature provides full-disk encryption by encrypting the entire drive and can require a PIN, password, or startup key before the operating system boots?
System Restore
Encrypting File System (EFS)
BitLocker Drive Encryption
File History
BitLocker Drive Encryption is Microsoft's built-in full-disk encryption solution. It encrypts the entire volume and, when configured with a TPM PIN, password, or startup key, blocks access until the correct authentication method is supplied at boot. Encrypting File System (EFS) works only at the file or folder level, System Restore merely rolls system files back to a previous state, and File History is a backup tool; none of these protect the whole drive at startup. [Microsoft Learn - BitLocker overview]
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