A Company Has a Private Cloud NAC Solution in Place

Multiple Choice

A company has a private cloud NAC solution in place to prevent unauthorized/non-company assets from connecting to the internal network. A cloud systems administrator cannot add a new physical server to the existing functioning cluster. Which of the following is the MOST likely cause of this issue?

A) Server objects were deleted.
B) The DNS and DHCP servers are down.
C) The new physical server has a faulty NIC.
D) Server MAC addresses are not being updated.