You have a TCP/IP network. This means that PC A and PC B have an IP address each. PC A knows PC B's address and creates an IP packet for PC B. Then, the packet (Layer 3) becomes an Ethernet frame (Layer 2): PC A gets PC B's MAC address and uses it as the destination L2 address.
When the frame arrives at SW1, the switch looks at the destination MAC address and controls (in its MAC table) to which port that address is associated. Then, the switch sends the frame to PC B through that port (forwarding phase).
The switch leaves unchanged BOTH the source and the destination MAC addresses inside the frame.
Answer C is correct.
By "after intial communication", 'intial comm.' here refers to the initial ARP (Address Resolution Protocol) connection.
ARP Request message is sent by PC A by sending a frame (layer 2 datagram) to PC B via the switch. Since PC A does not know the MAC address of PC B, but only the latter's ip address; the Switch receives the frame (source MAC address known, destination MAC address unknown) from PC A and in turn floods out a broadcast message to all its remaining ports on the same VLAN as the received frame.
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Thank you for sharing, brief and to the point. Good to know that someone is sharing what I was thinking.
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