which file is required for you to set up an environment such that every user on the other host is a

In Unix, which file is required for you to set up an environment such that every user on the other
host is a trusted user that can log into this host without authentication?

A.
/etc/shadow

B.
/etc/host.equiv

C.
/etc/passwd

D.
None of the choices.

Explanation:
The /etc/hosts.equiv file is saying that every user on the other host is a trusted user and allowed to
log into this host without authentication (i.e. NO PASSWORD). The only thing that must exist for a
user to log in to this system is an /etc/passwd entry by the same login name the user is currently

using. In other words, if there is a user trying to log into this system whose login name is “bhope”,
then there must be a “bhope” listed in the /etc/passwd file.