Which feature of Windows Pro or higher editions can encrypt startup files for the operating system, requires administrator activation, and is intended to encrypt storage volumes?

Files, particularly those required for startup and logon, can be protected using drive encryption with BitLocker. BitLocker is enabled by default in Windows 11 and can only be turned on or off by administrators. It is only available in the Pro or higher editions of Windows 10 and Windows 11. With the Encrypting File System (EFS), data can be encrypted at the volume, file, or folder level but it cannot encrypt an entire hard drive. Microsoft's online storage is called OneDrive, and ShadowDrive is not a computer term.