Which OSPF area type resembles the routing information in the L1 router’s table?

An IS-IS level 1-only router is configured within a larger multilevel hierarchy. Which OSPF area
type resembles the routing information in the L1 router’s table?

A.
OSPF default area

B.
OSPF stub area

C.
OSPF NSSA

D.
OSPF NSSA with no summaries