You have gained physical access to a Windows 2008 R2 server which has an accessible disc drive. When you attempt to boot the server and log in, you are unable to guess the password. In your toolkit, y

John the Ripper is a password cracking tool that attempts to recover passwords through brute-force or dictionary attacks on password hashes - it does not directly modify or reset account passwords.

SET (Social Engineering Toolkit) is a framework for performing social engineering attacks such as phishing and credential harvesting, and has no capability to modify Windows account databases.

CHNTPW (Change NT Password) is an offline Linux-based utility that directly edits the Windows SAM (Security Account Manager) registry hive, allowing a user to reset or blank any local account password and re-enable disabled or locked accounts without knowing the original password. Booting from a LiveCD like Ubuntu provides full access to the NTFS filesystem where the SAM file resides, making this attack possible without any network access or OS login.

Cain and Abel is a Windows-based password recovery and network sniffing tool that runs within a live Windows OS session, making it unusable from a Linux LiveCD to modify offline Windows accounts.