The mailserver is currently called fred, while the primary MX record points to
mailhost.example.org. What must be done to direct example.org email towards fred?
A.
Add another MX record pointing to fred’s IP address.
B.
Add a PTR record from mailhost to fred.
C.
Add an A record for mailhost to fred’s IP address.
D.
Add a CNAME record from mailhost to fred