Scenario: A network engineer has created and bound an UDP-ECV monitor to identify the
status of a UDP service. However, no matter what the response is, the service is always
marked as UP. A possible cause of this behavior is that the network engineer __________.
(Choose the correct option to complete the sentence.)

A.
forgot to add a receive string

B.
added the string ns_true as receive string

C.
added a string that is invalid and thus skipped

D.
added a string that is always part of the UDP handshake