You have a Windows 7 Enterprise workstation that is used by multiple users. You need to allow each of them to encrypt their own files on this workstation. Which tool should you use?

Encrypting File System (EFS) is an NTFS feature that allows specific users to encrypt individual files and folders on a volume. This enables each user to secure their own data on a shared workstation, preventing unauthorized access by other users.

BitLocker Drive Encryption is designed to encrypt entire hard drives or volumes, protecting data at rest from theft or loss of the entire computer, not for individual file encryption by multiple users.

ZIP is a file format used for data compression and archiving, and while it can include password protection, it does not provide the robust, integrated file-level encryption and access control capabilities of EFS for multiple users.

`Convert` is a command-line utility used to change a file system from FAT32 to NTFS and has no functionality related to file encryption.