Which two statements about OTV are true? (Choose two.)
A . OTV forwards and processes spanning-tree BPDUs between sites to ensure a loop-free topology.
B . All OTV overlay interfaces must use the same join interface.
C . OTV provides STP isolation because it does not transmit BPDUs across the overlay.
D . OTV utilizes the IS-IS routing protocol to propagate MAC address reachability information.
E . Multicast support in the transport network is a strict requirement to establish OTV adjacencies.
Answer: CD