Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF ASBR Summary LSA):
Type 4 LSAs (ASBR Summary LSAs) are originated by ABRs.
They inform routers in other areas about how to reach the ASBR (not about external prefixes, but about the ASBR's router ID).
Thus, correct answer: A.
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