Which Windows feature provides full-disk encryption by encrypting the entire system drive and can require the user to authenticate (for example, with a PIN, password, or USB key) before the operating system starts?
Windows Backup
BitLocker Drive Encryption
Encrypting File System (EFS)
System Restore
BitLocker Drive Encryption is the Windows feature that encrypts every sector of the selected volume and can use TPM-based or external authentication (PIN, password, smart card, or USB key) during the boot sequence. This prevents unauthorized users from reading data even if the drive is removed. Encrypting File System (EFS) only protects individual files or folders after Windows has started, System Restore rolls the OS back to a previous state without providing encryption, and Windows Backup creates copies of data but does not secure it through encryption.
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