Which Windows tool is specifically used for encrypting removable drives?

The correct answer is C, BitLocker to Go. This tool is specifically designed for encrypting removable drives, such as USB flash drives and external hard disks, providing an additional layer of security for data stored on these devices. BitLocker to Go allows users to control access to removable drives by requiring a password or a smart card for decryption, ensuring that only authorized users can access the data.

BitLocker to Go integrates seamlessly with the Windows operating system, making it user-friendly and effective for those needing to secure sensitive information while using portable storage. It helps protect against unauthorized access if the removable drives are lost or stolen.

In comparison, Windows Defender is primarily a security tool focused on protecting against malware and other threats, while the Encrypting File System (EFS) is designed to encrypt files and folders on fixed drives, rather than removable media. Windows Backup is a tool for data backup and recovery, without a specific focus on encryption. Therefore, the unique functionality of BitLocker to Go for removable drives clearly makes it the correct choice.