Which configuration step is required when configuring an OSPF stub area?

Which configuration step is required when configuring an OSPF stub area?

A.
You must configure the command stub under [edit protocols ospf] on the ASBR.

B.
You must configure the command stub on all routers under [edit protocols ospf].

C.
You must configure the command stub under [edit protocols ospf area] on the ABR.

D.
You must configure the command stub on all routers under [edit protocols opsf area].