A series of Auto Deploy ESXi 5.x hosts which utilize vSphere Standard Switches are unable to
boot. In prior testing, all of the hosts were able to boot successfully.
Which two conditions might cause this issue? (Choose two.)

A.
The Hosts are unable to connect to the SAN.

B.
The TFTP server is down.

C.
The DNS server is down.

D.
The DHCP server is down.