In the switching network shown in the figure, all three switches have only the default VLAN 1. The interconnected ports of the three switches are all Trunks, and all VLANs are allowed to pass. The global and port GVRP functions are enabled on the three switches. VLAN 10 is created on the switch SWA, VLAN 20 is created on the switch SWC, and the GVRP registration mode of the Ethernet 1/0/1 port on the switch SWA is set to Fixed. Check the status information of each Trunk port on the three switches. Which of the following is correct?

A . [SWA] display interface Ethernet 1/0/1 Ethernet1/0/1 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 (sec)Port link-type: trunk
VLAN passing: 1 (default vlan), 10, 20
VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q
B . [SWB] display interface Ethernet 1/0/1 Ethernet1/0/1 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 （ sec ） Port link-type: trunk
VLAN passing: 1 （ default vlan ）， 10 ， 20
VLAN permitted: 1 （ default vlan ）， 2-4094 Trunk port encapsulation: IEEE 802.1q
C . [SWB] display interface Ethernet 1/0/2 Ethernet1/0/2 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 （ sec ） Port link-type: trunk
VLAN passing: 1 （ default vlan ）， 10 ， 20
VLAN permitted: 1 （ default vlan ）， 2-4094 Trunk port encapsulation: IEEE 802.1q
D . [SWC] display interface Ethernet 1/0/1 Ethernet1/0/1 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 (sec)Port link-type: trunk
VLAN passing: 1 (default vlan), 10, 20
VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q

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