Which two statements describe what is required to set up a Small Community Network (SCN) consisting of four IP500v2 control units? (Choose two.)

Which two statements describe what is required to set up a Small Community Network (SCN) consisting of four IP500v2 control units? (Choose two.)
A . The extension, user, and group numbering on each system must be unique.
B . The user and group names on each system must be unique.
C . Combo Cards are required in all systems.
D . The underlying network must be configured as a flat layer 2 subnet.
E . The total number of users within the Small Community Network must not exceed 250.

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Answer: A,B