The correct answer is A, Mimikatz. In CEH system hacking and post-exploitation topics, Windows credential attacks commonly focus on hashes, cached credentials, Kerberos tickets, and authentication material stored in memory or in Windows credential stores. The CEH-related material identifies Mimikatz as the de facto standard tool for extracting credentials from Windows memory and states that it can steal hashes, PIN codes, and Kerberos tickets from memory, as well as support pass-the-hash, pass-the-ticket, and Golden Ticket attacks. This directly matches the question’s phrase “dumps Windows hashes.” John the Ripper is mainly a password-cracking tool used after hashes are obtained. Hydra is primarily an online login/password attack tool for network services. Aircrack-ng is used mainly for wireless password/key cracking. Therefore, among the options, Mimikatz is the tool most specifically associated with dumping Windows credentials and hashes during the system hacking phase.