Which two statements about OTV are true? (Choose two.)
A.
OTV join interfaces must be physical interfaces.
B.
OTV supports authentication of hello messages and control plane PDUs.
C.
Multicast support in the transport network is a strict requirement to establish OTV adjacencies.
D.
All OTV overlay interfaces must use the same join interface.
E.
OTV forwards and processes spanning-tree BPDUs between sites to ensure a loop-free topology.
F.
OTV propagates MAC address reachability information via the underlying IS-IS control-plane.