What does a PE do when a frame is received in a VPLS service with an unknown destination address by default?

What does a PE do when a frame is received in a VPLS service with an unknown destination address by default?
A . Drop the frame.
B . Flood the frame to all PEs participating in the service.
C . Send a destination unreachable message back to the originating host.
D . Store the frame until the destination is known

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Answer: B