Which of the commands below can you use to configure a default route?（）

A、TK1(config)# ip route 0.0.0.0 0.0.0.0 E0

B、TK1(config)# ip route 0.0.0.0 255.255.255.255 S0

C、TK1(config-interface)# ip route 255.255.255.255 0.0.0.0 192.168.1.21

D、TK1(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.21

E、TK1(config)# ip route 0.0.0.0 192.168.1.21 255.255.255.255

F、TK1# ip default-network 0.0.0.0 192.168.1.21 255.255.255.255