A Server Administrator Suspects That an Unauthorized Email Relay Agent

Multiple Choice

A server administrator suspects that an unauthorized email relay agent is running on a web server. The web server has a hostname of web1.example.com and an IP address of 199.90.89.51. Which of the following commands should the server administrator execute to verify these suspicions?

A) telnet web1.example.com 25
B) telnet web1.example.com 23
C) telnet 199.90.89.51
D) telnet 199.90.89.51 80