What two actions should be taken to accomplish this segregation?

A network engineer wants to segregate three interconnected campus network via IS-IS routing.

A two-layer hierarchy must be used to support large routing domains to avoid more specific routes from each campus network being advertised to other campus network routers automatically.

What two actions should be taken to accomplish this segregation? (Choose two).
A . Assign a unique IS-IS NET value for each campus and configure internal campus routers with level 1 routing.
B . Designate two IS-IS routers from each campus to act as a Layer 1/Layer 2 backbone routers at the edge of each campus network.
C . Designate two IS-IS routers as BDR routers at the edge of each campus.
D . Assign similar router IDs to all routers within each campus.
E . Change the MTU sizes of the interface of each campus network router with a different value

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Answer: AB