Your network consists of a single Active Directory domain. The domain contains one ISA Server 2006 Enterprise Edition array. The array contains two servers named ISA1 and ISA2. Both servers have the Configuration Storage server role installed. Both servers connect to each other by using dedicated network adapters named Adapter1 and Adapter2. You enable integrated Network Load Balancing for the array. You need to ensure that changes to the firewall policy are replicated between ISA1 and ISA2.
You must not disable Network Load Balancing.
What should you do?

A.
Add the UnicastInterHostCommSupport registry key to ISA1 and ISA2.

B.
Define the operation mode of the Network Load Balancing cluster as Multicast.

C.
Reconfigure the array to use custom DNS entries for the Configuration Storage servers primary definition and alternate definition. Run the Setspn.exe program to add each DNS entry to the Kerberos database.

D.
Reconfigure the array to use custom DNS entries for the Configuration Storage servers primary definition and alternate definition. In the Active Directory Users and Computers console, enable the Trusted for Delegation setting on ISA1 and on ISA2.