In the switching network shown in the figure, VLAN 10 is set as lsolate-user- vlan on switch SWA, and VLAN 2 and VLAN 3 are secondary VLANs of VLAN 10; VLAN 2 and VLAN 20 are created on switch SWB, and VLAN 20 is set as lsolate-user-vlan, and VLAN 4 is secondary VLAN of VLAN 20. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?

A . PCA’s message enters from SWA’s GigabitEthem1/0/1 port and comes out from GigabitEthem1/0/3 port with the VLAN tag VLAN2.
B . PCA’s message comes out of SWA’s GigabitEthem1/0/ port and enters SWB’s GigabitEthem1/0/4 port. The VLAN tag it carries is VLAN20.
C . When SWB accesses PCA, the VLAN tag of the message from SWB’s GigabitEthem1/0/4 is VLAN10
D . SWB’s message enters from SWA’s GigabitEthem1/0/3 port, and the VLAN tag it carries after exiting from GigabitEthem1/0/3 port is VLAN20

Answer: B