Which command is used to configure a default route?

Which command is used to configure a default route?

A.
ip route 172.16.1.0 255.255.255.0 0.0.0.0

B.
ip route 172.16.1.0 255.255.255.0 172.16.2.1

C.
ip route 0.0.0.0 255.255.255.0 172.16.2.1

D.
ip route 0.0.0.0 0.0.0.0 172.16.2.1