Your network contains an Active Directory domain named contoso.com. The domain contains a 
member server named Server1. Server1 runs Windows Server 2012 R2 and has the DHCP Server 
server role installed. You create two IPv4 scopes on Server1. The scopes are configured as shown in the following table：

The DHCP clients in Subnet1 can connect to the client computers in Subnet2 by using an IP address or a FQDN.You discover that the DHCP clients in Subnet2 can connect to client computers in Subnet1 by using an IP address only. You need to ensure that the DHCP clients in both subnets can connect to any other DHCP client by using a FQDN. 
What should you add？（）