Which statement explains how OSPF meets this requirement?

You have configured an OSPF stub area. The routes in the stub area require external reachability.
Which statement explains how OSPF meets this requirement?

A.
The ABR will generate a 0.0.0.0/0 martian route in the area.

B.
The ABR will flood Type 5 LSAs into the area.

C.
The ABR will flood Type 7 LSAs into the area.

D.
The ABR will generate a 0.0.0.0/0 default route in the area.

Explanation:
Reachability for routes external to OSPF is achieved via a 0/0 default route injected by the ABR.
https://forums.juniper.net/jnet/attachments/jnet/Learning/58/2/AJNR_Module02_OSPF-Stub_5-1-
0_Alpha.ppt