A system administrator runs a network inventory scan every Friday at 10:00 am to track the progress of a
large organization’s operating system upgrade of all laptops. The system administrator discovers that
some laptops are now only being reported as IP addresses. Which of the following options is MOST likely
the cause of this issue?

A.
HIDS

B.
Host-based firewalls rules

C.
All the laptops are currently turned off

D.
DNS outage