Answer:  A 

Explanation:

There are two types of routing on the devices. First is the static routing where route is entered manually on the device and second is the dynamic routing where routes changes on the basis of learnings from the neighbouring devices. In case of static routing the routes need to be changed manually if there is a change in the topology however this is not the case in terms of dynamic routing.

On the router if you want all the traffic to go through to a specific gateway or create a default route on the router then the same is represented by 0.0.0.0. Also we use wildcard mask so the same gets mentioned as 0.0.0.0 0.0.0.0.

On a router the static route is entered like this:

Router(config)# ip route

If we have to fill the routes in the above command then this would be like this:
Router(config)# ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1

The other options shown in option B & D doesn’t match as they fail to capture the default traffic. In Option C, the answer is wrong because the ip mask need to be wildcard mask instead of subnet mask.