What line must be added to /etc/mail/access to allow this?

The internal network (192.168.1.0-192.168.1.255) needs to be able to relay email through the
site’s sendmail server. What line must be added to /etc/mail/access to allow this?

A.
192.168.1.0/24 RELAY

B.
192.168.1 RELAY

C.
192.168.1.0/24 OK

D.
192.168.1 OK