If the interconnection interfaces of switches SWA, SWB, and SWC allow all VLANs to pass, what can we learn from the above information?

The customer’s LAN switch SWA is connected to SWB via GigabitEthernet 2/0/1 and to SWC via GigabitEthernet 2/0/2 and the SWA switch has the following configuration:

[SWA] smart-link group 1

[SWA-smlk-group1] protected-vlan reference-instance 0 to 32

[SWA-smlk-group1] port gigabitethernet 2/0/1 slave

[SWA-smlk-group1] port gigabitethernet 2/0/2 master

[SWA-smlk-group1] flush enable control-vlan 10

If the interconnection interfaces of switches SWA, SWB, and SWC allow all VLANs to pass, what can we learn from the above information?
A . Normally, the SWA switch traffic will be upstream through Gigabitethernet 2/0/1
B . Under normal circumstances, SWA switch traffic will be upstream through Gigabitethernet 2/0/2
C . If the GigabitEthernet 2/0/1 port fails, the SWA switch will broadcast flush messages in all VLANs.
D . If the Gigabitethernet 2/0/2 port fails, the SWA switch will broadcast flush messages in all VLANs.