Which security feature provides encryption for full drives on Windows operating systems?

BitLocker is the correct choice for providing encryption for full drives on Windows operating systems. This feature, integrated directly into the Windows operating system, allows users to encrypt entire volumes to protect data from unauthorized access. It utilizes the AES encryption algorithm to secure the drive and can be activated through various means, including the Control Panel or Windows settings.

One of the standout benefits of BitLocker is its ability to provide transparent encryption, meaning that users can access their files as usual without having to decrypt them each time. Additionally, BitLocker supports the use of a Trusted Platform Module (TPM), which enhances security by storing encryption keys in a hardware chip, making it much more difficult for potential attackers to access the encrypted data without authorization.

FileVault is specific to macOS and cannot be used on Windows operating systems. TrueCrypt, while offering similar functionalities, is no longer maintained or considered secure, and its use is not recommended for encrypting drives. Secure Boot is a security feature that focuses on ensuring that only trusted software is loaded during the boot process, rather than providing data encryption, hence not related to full drive encryption.