What needs to be done on the client to enable it to use the router as its default gateway?

A network client has an ethernet interface configured with an IP address in the subnet 192.168.0.0/24. This subnet has a router, with the IP address 192.168.0.1, that connects this subnet to the Internet. What needs to be done on the client to enable it to use the router as its default gateway?

A.
Run route add default gw 192.168.0.1 eth1.

B.
Run route add gw 192.168.0.1 eth1.

C.
Run ifconfig eth0 defaultroute 192.168.0.1.

D.
Add "defaultroute 192.168.0.1" to /etc/resolv.conf.

E.
Run route add defaultgw=192.168.0.1 if=eth0.