Users contact you and report that they are getting no output from the who command.
Your first action is to check that the file that the who command reads for its output is present.
Which file does the who command read to obtain its output?

A.
/var/adm/utmp

B.
/var/adm/wtmpx

C.
/var/adm/utmpx

D.
/var/adm/users