Add active and standby SCs on SMC2.0, which of the following statements is correct () (multiple choice)

Add active and standby SCs on SMC2.0, which of the following statements is correct () (multiple choice)
A . The license information of the active SC and the backup SC must be the same
B . In the process of SC active/standby configuration, the "Mode" parameter indicates the working status of the SC, the "Mode" value is 1 for standby, and the "Mode" value is 2 for active
C . The service IP is a virtual I
D . The active SC and the standby SC share this virtual service IP to provide external registration and call services
E . The management IP address and service IP address of the active SC can be in two different network segments

Answer: A,C,D