Refer to the Exhibit.
In the exhibit, an OSPF virtual link is established between R2 and R3. However, R4 cannot reach
any external destinations.
What must you do you allow R4 to reach external destinations?
Area 1 must be configured as a stub area.
Area 1 must be configured as a standard OSPF area.
Area 1 must be configured to use the Type 3 LSAs as the default LSA.
The virtual link must be configured under Area 1.