If switches SWB, SWC, and SWD form sub-ring 2, switches SWB, SWC, and SWE form sub-ring 3, which of the following can be known from the above information?

The customer LAN switches SWA, SWB, and SWC form the RRPP ring main ring 1. The switch SWA has the following configuration information:

[SWA] rrpp domain 1

[SWA-rrpp-domain1] control-vlan 4092

If switches SWB, SWC, and SWD form sub-ring 2, switches SWB, SWC, and SWE form sub-ring 3, which of the following can be known from the above information?
A . Switches SWB, SWC, and SWD can use VLAN 4092 as the sub-ring 2 control VLAN
B . Switches SWB, SWC, and SWE cannot use VLAN 4092 as the sub-ring 3 control VLAN
C . The control VLAN of sub-ring 2 must be different from the control VLAN of sub-ring 3.
D . To facilitate the management of the main ring, you can configure an IP management address on the sub-ring 3 control VLAN

Answer: B