Which two conditions might cause this issue?

A series of Auto Deploy ESXi hosts which utilize vDS 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 have experienced a network error.

B.
The Auto Deploy server permissions are invalid.

C.
vCenter Server is down.

D.
The hosts have experienced a local disk error.

Explanation: