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.