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 an A record for mailhost to fred’s IP address.
B.
Add a CNAME record from mailhost to fred
C.
Add another MX record pointing to fred’s IP address.
D.
Add a PTR record from mailhost to fred.
Explanation:
If there is already an A record for mailhost.example.org you need to change this to freds ip address.