Refer to the exhibit. An engineer is designing a multiarea OSPF network for a client who also has a large EIGRP domain. EIGRP routes are getting redistributed into OSPF. OSPF area 20 has routers…

A stub area blocks all Type 5 LSAs entirely, which would prevent both EIGRP 111 and EIGRP 222 routes from reaching area 20, not just EIGRP 111.

Filtering Type 5 LSAs on the ASBR between EIGRP 111 and area 0 suppresses those routes domain-wide, not selectively for area 20, and would affect all other OSPF areas as well.

An NSSA does not accept Type 5 LSAs flooded from ASBRs in other areas, which prevents EIGRP 111 external routes from propagating into area 20. A local ASBR in area 20 can still redistribute EIGRP 222 routes as Type 7 LSAs, which the ABR then translates into Type 5 LSAs for the rest of the OSPF domain - satisfying both the filtering and the selective redistribution requirements while reducing memory and CPU load on area 20 routers.

Type 3 LSAs carry inter-area summary routes, not external redistributed routes; filtering them on the ABR would not affect EIGRP-redistributed Type 5 LSAs propagating into area 20.