A network technician is on the phone with the system administration team. Power to the
server room was lost and servers need to be restarted. The DNS services must be the first
to be restarted. Several machines are powered off. Assuming each server only provides one
service, which of the following should be powered on FIRST to establish DNS services?

A.
Bind server

B.
Apache server

C.
Exchange server

D.
RADIUS server