正解:B
BitLocker is a full-disk encryption feature included with certain editions of Windows, designed to protect data by providing encryption for entire volumes.
Option A: FileVaultFileVault is a disk encryption program in macOS, not Windows.
Option B: BitLockerBitLocker is the correct tool for disk encryption on Windows operating systems, providing full disk encryption.
Option C: Private KeyA private key is part of public key infrastructure (PKI) used in encryption, but it is not a tool for disk encryption by itself.
Option D: PowerShellPowerShell is a task automation and configuration management framework from Microsoft, not a tool for disk encryption.
Reference:
CompTIA A+ 220-1102 Objective 2.5 (Manage and configure basic security settings in the Windows OS), particularly BitLocker for disk encryption.