Which mechanism is enabled by default in the OTV technology to conserve bandwidth?

Which mechanism is enabled by default in the OTV technology to conserve bandwidth?
A . Control plane traffic is prevented from traversing the OTV link
B . Unknown unicast flooding is suppressed over the OTV link.
C . BPDUs are allowed to traverse the OTV link
D . Data plane traffic is prevented from traversing the OTV link.

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Answer: B