In the switching network shown in the figure, VLAN10 is set as isolate-user-vlan on switch SWA, VLAN2 and VLAN3 are secondary VLANs of VLAN 10; VLAN2-VLAN20 is created on switch SWB, and VLAN20 is set as isolate-user-vlan, and VLAN4 is the secondary VLA of VLAN20. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?

A . The PCA message enters from the GigabitEthem1/0/1 port of SWA and comes out from the GigabitEthem1/0/3 port with the VLAN Tag VLAN 1
B . PCA’s message comes out of SWA’s GigabitEthem1/0/3 port and enters SWB’s GigabitEthem1/0/4 port. The VLAN tag it carries is VLAN 10.
C . When SWB accesses PCA, the message from SWB’s GigabitEth1/0/4 does not carry a VLAN Tag
D . SWB’s message enters from SWA’s GigabitEthem1/0/3 port and leaves from GigabitEthem1/0/1 port with the VLAN tag VLAN10.

Answer: C