In the network connection shown in the figure, SWA and SWB are three-layer switches, running STP+VRRP, and after the initial configuration is completed, SWA is the root of STP and the master of VRRP, and SWC is the downlink access terminal of the two-layer switch. Which of the following description of the network link failure is correct?

A . When the link between SWA and SWB is disconnected, the STP topology will change, and both uplink ports of SWC will become Forwarding
B . When the link between SWA and SWB is disconnected, the VRRP Master will switch and SWB will become the new VRRP Master
C . When the link between SWA and SWC is disconnected, the STP topology will change, and G1/0/2 of SWC will become Forwarding
D . After the link between SWA and SWC is disconnected, the VRRP Master will remain unchanged, but the SWC downstream terminal will not communicate with the gateway.

Answer: A