You need to ensure that only domain members can register DNS records in the zone

Your network contains an Active Directory domain. All DNS servers are domain controllers. You view the properties of the DNS zone as shown in the exhibit. (Click the Exhibit button.)

You need to ensure that only domain members can register DNS records in the zone. What should you do first?

A.
Modify the zone type.

B.
Create a trust anchor.

C.
Modify the Advanced properties of the DNS server.

D.
Modify the Dynamic updates setting.