An engineer has found that voice traffic on the WLAN with ID XXXXXXXXX is being sent at best effort from a client that is experiencing issues despite having QoS and CAC enabled. Which option causes the traffic to be sent at best effort?
A. The QoS profile for Platinum has been left at default settings.
B. The client does not support TSPEC.
C. WMM is configured as required.
D. msl qos trust cos is not required on the switchport.
