Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (Supported OSPF Area Types):
A: NSSA (Not So Stubby Area) — Supported.
C: Stub Areas — Supported.
B: Level 1 Areas — IS-IS concept, not OSPF.
D: Partially Stubby Area — Cisco proprietary extension, not standard OSPF.
Thus, correct answers: A, C.
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