You work as a network administrator at ABC.com. The ABC.com network consists of an Active Directory Domain Services domain named ABC.com. All servers on the network run Windows Server 2008 R2. The client computers in the domain run Windows 7 Professional.

You use Microsoft Volume Licensing for the Windows 7 client computers and Windows Server 2008 R2 servers.

A newly installed server named ABC-KMS1 runs the Key Management Service (KMS) to activate the volume licenses. You discover that the client computers are not being activated.

You suspect a DNS issue. You check the DNS zone for ABC.com and verify that there is a Host (A) record for ABC-KMS1.

Which other type of DNS record should you check for?

A.
You should check that a PTR record exists for ABC-KMS1.

B.
You should check that an SOA record exists for ABC-KMS1.

C.
You should check that an SRV record exists for ABC-KMS1.

D.
You should check that a CNAME record exists for ABC-KMS1.