A penetration tester has found indicators that a privileged user's password might be the same on 30 different Linux systems. Which of the following tools can help the tester identify the number of…

Hydra is a powerful, parallelized login cracker that supports a multitude of protocols for online brute-force and dictionary attacks against remote services. It is specifically designed to efficiently test a list of usernames and passwords against multiple hosts, making it ideal for determining how many Linux systems are vulnerable to a suspected password.

John the Ripper is primarily an offline password cracker used for auditing password hashes obtained from files, not for online attacks against remote systems.

Cain and Abel is a password recovery tool specifically designed for Microsoft Windows operating systems, making it unsuitable for Linux systems.

While Medusa is also an online brute-force cracking tool similar to Hydra, Hydra is widely recognized for its extensive protocol support and widespread use, making it the more commonly chosen and robust option for this specific scenario among the given choices.