Which option shows a correctly configured IPv4 default static route?
a. ip route 0.0.0.0 0.0.0.0 S0/0/0
b. ip route 0.0.0.0 255.255.255.0 S0/0/0
c. ip route 0.0.0.0 255.255.255.255 S0/0/0
d. ip route 0.0.0.0 255.0.0.0 S0/0/0