Which OSPF router or routers would require the following command to define a stub area?

Question:

Which OSPF router or routers would require the following command to define a stub area?

router(config-router)# area [ area-id ] stub

• only the ASBR attached to the stub area
• only the ABR for the stub area
• all routers in the stub area
• only the DR and BDR routers in the stub area

Explanation: The area type flag in hello packets must match between adjacent OSPF routers. For this reason, all routers in the stub area must be configured as a stub area.

Exam with this question: CCNP Enterprise: Advanced Routing (Version 8.0) – OSPF Exam