which of the following should be powered on FIRST to establish DNS services?

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