When using Overlay Transport Virtualization （OTV）， how do L2 multicast frames traverse the overlay？（）
- A The L2 multicast frames are encapsulated in an OTV packet using the configured control-group multicast address for transport
- B The L2 multicast frames are dropped because multicast cannot be carried across the overlay
- C The L2 multicast frames are encapsulated in an OTV packet using the configured data-group multicast address for transport
- D The L2 multicast frames are forwarded natively across the overlay based on their multicast ID