What happens immediately after an Ethernet switch receives an Ethernet frame?

What happens immediately after an Ethernet switch receives an Ethernet frame?
A . It records the destination MAC address and the interface on which it arrived.
B . It records the source MAC address and the interface on which it arrived.
C . It floods the frame out of all its interfaces except the interface on which the frame arrived.
D . It transmits the frame out of the appropriate interface.

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Answer: B