Which two statements describe advantages of using BGP for VPLS signaling instead of LDP signaling? (Choose two.)

Which two statements describe advantages of using BGP for VPLS signaling instead of LDP signaling? (Choose two.)
A . There is no need for MPLS signaling protocol.
B . There is a well-defined scaling hierarchy.
C . There is a separation of signaling from other services.
D . There is auto discovery.

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Answer: B,D