Phone calls have been successful with acceptable audio quality over a WAN link. Recent
configuration changes in the WAN routers have resulted in the inability to hear any audio on new
calls across the WAN.
Which configuration changes directly cause a loss of audio?

A.
a WAN router access list that blocks all UDP ports greater than 10,000

B.
a WAN router access list that blocks all UDP ports lesser than 10,000

C.
a WAN router access list that blocks all TCP ports greater than 10,000

D.
a WAN router access list that blocks all TCP ports lesser than 10,000