Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Types):
"Type 2 LSAs are Network LSAs generated by the Designated Router (DR) on broadcast and NBMA networks to describe the network and its attached routers." Thus, correct answer is C.
-

Detailed Analysis:
In this topology, router R5 is connected to a non-OSPF environment and must redistribute external routes into OSPF.
R5 is acting as an ASBR.
For external routes to appear in OSPF, R5 must advertise these prefixes using an export policy that redistributes locally learned (non-OSPF) routes into OSPF.
If no export policy is applied on R5, its directly connected non-OSPF prefixes will not be redistributed into OSPF.
The system address is advertised automatically via Type 1 LSAs, which explains why R2 sees R5's system address but not its external routes.
-
Thus, correct answer:
C). Router R5 does not have an export policy for these prefixes.

Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (RIP Route Export Configuration):
"RIP on the Nokia 7750 SR does not automatically advertise locally attached routes. A route policy must be used to export locally learned routes into RIP." Route policies control what routes are exported from the local routing table into RIP advertisements.
No access-list or neighbor configuration is required for this.
Thus, correct answer is A.
-