Which of the Following is a Correct Default Route

ip route 192.168.10.0 0.0.0.0 serial 2/0

ip route 0.0.0.0 172.16.30.2 192.168.20.2

ip route 0.0.0.0 0.0.0.0 fastEthernet 1/0

ip route 10.0.0.0 0.0.0.0 192.168.10.2


in a default route both network address and  subnet mask is set to all zeros followed by next hop ip address or exit interface of the router, in this case it is exit interface fastEthernet 1/0