The network topology is shown in the figure. STP is enabled on SWA and SWD. Which of the following statements about the changes in the status of SWA and SWD ports are correct?

A . SWD port E0/1 will change from a designated port to a root port in the Listening state.
B . If the cost value of the SWD port E0/2 link is changed to 100, port E0/2 will immediately become the new root port and enter the Forwarding state.
C . If the bridge priority of SWD is set to 0, the ports E0/1 and E0/2 of SWD will enter the Forwarding state after the Listening state and the Learning state.
D . If the bridge priority of SWD is set to 0, the role of port E0/1 of SWA will change from designated port to root port, and the port will maintain the Forwarding state during the change.

Answer: A