What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?

What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?
A . The Layer 2 switch forwards the packet and adds the destination MAC address to its MAC address table.
B . The Layer 2 switch sends a copy of a packet to CPU for destination MAC address learning.
C . The Layer 2 switch floods packets to all ports except the receiving port in the given VLA
E . The Layer 2 switch drops the received frame.

Answer: C