Multicast video applications typically require special treatment on the Wi-Fi network due to the nature of
multicast traffic. Many vendors implement proprietary multicast-to-unicast conversion for this reason.
Which of the following is NOT a valid reason for special unicast conversion of downlink multicast traffic?

A.
In QoS WLANs, multicast traffic is always assigned to the best effort (AC_BE) transmit queue.

B.
Group addressed downlink frames are not acknowledged on the wireless medium.

C.
Multicast traffic must always be transmitted via omnidirectional antennas.

D.
Frames with a group receiver address must always be sent at a rate in the Basic Rate Set.