Which of the following protocols can be protected by Protocol Security Manager? (Choose 3)

FTP is actually a PSM-supported protocol - if marked incorrect in isolation, it is because this 'choose 3' question requires selecting FTP together with HTTP and SMTP as a group, not as a standalone single answer.

SSH is an encrypted transport-layer protocol; PSM does not perform inspection or enforcement on SSH sessions as it cannot inspect the encrypted payload.

HTTP is a PSM-supported protocol and should be selected - similar to FTP, it is part of the correct three-choice group alongside FTP and SMTP.

SMTP is one of the core protocols protected by F5 Protocol Security Manager, which can inspect SMTP sessions to enforce protocol compliance and block attacks such as command injection or header manipulation. PSM also protects FTP (choice A) and HTTP (choice C), making those three the correct selections for a 'choose 3' question.

Telnet is a legacy remote access protocol and is not within the scope of protocols that Protocol Security Manager is designed to inspect or protect.