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?

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

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Answer: B