Which IOS command is used to initiate a login into a VTY port on a remote router?

A.
router# login

B.
router# telnet

C.
router# trace

D.
router# ping

E.
router(config)# line vty 0 5

F.
router(config-line)# login

Explanation:
VTY ports are telnet ports hence command B will initiate login to the telnet port.