Which command logs you in as user1 to the remote system pub_server?

A.
rlogin pub_server l user1

B.
rlogin pub_server u user1

C.
login r pub_server u user1

D.
rlogin h pub_server l user1

Explanation:

-l is used to specify a different user account than the one currently logged in to, otherwise rlogin will attempt to log in to the remote server using your current user account.
There are no options u, -r or h with the rlogin command.