The clients and DHCP server reside on different subnets. Which command must be used to forward requests and replies between clients on the 10.10.0.1/24 subnet a...

The clients and DHCP server reside on different subnets.
Which command must be used to forward requests and replies between clients on the 10.10.0.1/24 subnet and the DHCP server at 192.168.10.1?

A. ip route 192.168.10.1 B. ip dhcp address 192.168.10.1 C. ip default-gateway 192.168.10.1 D. ip helper-address 192.168.10.1