What does a switch do when it receives a frame whose destination MAC address is missing from the MAC address table?

A. It changes the checksum of the frame to a value that indicates an invalid frame.
B. It updates the CAM table with the destination MAC address of the frame.
C. It appends the table with a static entry for the MAC and shuts down the port.
D. It floods the frame unchanged across all remaining ports in the incoming VLAN.