Your company has a single Active Directory Domain Services (AD DS) domain named contoso.com that uses Active DirectoryCi

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Your company has a single Active Directory Domain Services (AD DS) domain named contoso.com that uses Active DirectoryCintegrated DNS.
You deploy the Key Management Service (KMS) on a Windows 7 computer.
You need to ensure that Windows 7 client computers can locate the KMS host and perform activation.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A. Create and deploy a GPO firewall rule to allow RPC traffic through TCP port 1688 on the client computers.
B. Deploy a Windows Server 2008 KMS host.
C. Grant the KMS server the Full Control permission on the _vlmcs._tcp.contoso.com DNS record.
D. Grant the KMS server the Full Control permission on the _msdcs._tcp.contoso.com DNS zone.