Which two statements best describe an OSPF deployment? (Choose two.)

A.
External routes are propagated into the autonomous system from regular areas or NSSA via
ABR.

B.
ABR requires manual configuration forclassful network summarization.

C.
ABR provides automaticclassful network boundary summarization.

D.
External routes are propagated into the autonomous system from regular areas or NSSA via
ASBR.

E.
External routes are propagated into the autonomous system from stub areas via ASBR.