What functionality best defines the use of a ‘stub’ area within an OSPF environment?

What functionality best defines the use of a ‘stub’ area within an OSPF environment?

A.
A stub area appears only on remote areas to provide connectivity to the OSPF backbone.

B.
A stub area is used to inject the default route for OSPF.

C.
A stub area uses the no-summary keyword to explicitly block external routes, defines the non- transit area, and uses the default route to reach external networks.

D.
A stub area is used to reach networks external to the sub area.