A network engineer wants to segregate three interconnected campus networks via ISIS routing. A two-layer hierarchy must

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A network engineer wants to segregate three interconnected campus networks via ISIS 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 ISIS NET value for each campus and configure internal campus routers with Level 1 routing.
B. Designate two ISIS routers from each campus to act as a Layer 1/Layer 2 backbone routers at the edge of each campus network.
C. Assign similar router ID to all routers within each campus.
D. Designate two ISIS routers as BDR routers at the edge of each campus.
E. Change the MTU sizes of the interface of each campus network router with a different value.