Given: Assume that music on hold (MOH) features are unicast only.
What VoWiFi implementations require multicast packet delivery support by the WLAN infrastructure?

A.
All VoWiFi implementations

B.
Push-to-Talk VoWiFi phones

C.
VoWiFi soft phones

D.
FMC phones

E.
Flat (non-VLAN) VoWiFi implementations