Your network has one subnet for servers and one subnet for client computers. The subnets are separated by a router. In the server subnet, Server1 is a Windows Server 2008 R2 server that runs DHCP and DNS.
Your deployment infrastructure is configured to allow computers in the client computer subnet to boot by using PXE. However, client computers that attempt to use PXE to boot are not able to connect to the deployment infrastructure.
You need to ensure that client computers are able to connect to the deployment infrastructure by using PXE.
What should you do?

A.
Configure DHCP reservations.

B.
Configure an IP Helper Address on the router.

C.
Place a DNS server in the client computer subnet.

D.
Run the netsh dhcp add server Server1 command.