what command would be used to set the default route on Router 2 to 171.68.64.6 (Router 3)?

Click the Exhibit button to view the topology.

With RIP running, what command would be used to set the default route on Router 2 to
171.68.64.6 (Router 3)?

A.
ip default-network 171.68.64.6

B.
ip route 0.0.0.0 255.255.255.255 171.68.64.6

C.
ip route 0.0.0.0 0.0.0.0 171.68.64.6

D.
None of the above