Which of the following explanations is MOST likely the issue?

A technician is called into an office where multiple users are reporting duplicate IP address
errors. Upon arrival, the technician skims notes from the previous technician who serviced
the office and finds that DHCP functionality was disabled on the internal router. Which of the
following explanations is MOST likely the issue?

A.
The previous technician turned off DHCP to free up resources for QoS functionality.

B.
The previous technician decided to use DNS instead of DHCP for handling IP addresses.

C.
The previous technician moved the office to a mismanaged static IP address setup.

D.
The previous technician did not setup DHCP reservations properly and therefore the
router is giving multiple users the same IP.