Which of the following statements about an MSP ring are correct? (Multiple Choice)
A . The number of nodes on an MSP ring cannot exceed 16.
B . When creating a protection subnet, select SDH NEs only. Do not select REG or WDM NEs.
C . When multiple protection subnets occupy the same port on the same board, you must select "Resource Sharing".
D . "Assigned by VC4" means that different VC4s are assigned to different protection subnets to achieve MSP only in some channels.
Answer: ABCD