Which two tasks does the bridge perform in response to receiving a frame with an unknown unicast destination MAC address?

An Ethernet bridge is configured such that all interfaces are in a single broadcast domain.Which two tasks does the bridge perform in response to receiving a frame with an unknown unicast destination MAC address? (Choose two.)

A.
It drops the frame.

B.
It floods the frame out of all interfaces except the one on which is was received.

C.
It learns the destination MAC address.

D.
It learns the source MAC address.