You need to configure the adatum.com zone to support Name Protection

Your network contains an Active Directory domain named contoso.com. The domain
contains a domain controller named DC1 that runs Windows Server 2012 R2. DC1 has the
DNS Server server role installed.
The network contains client computers that run either Linux, Windows 7, or Windows 8.
You have a zone named adatum.com as shown in the exhibit. (Click the Exhibit button.)

You plan to configure Name Protection on all of the DHCP servers.
You need to configure the adatum.com zone to support Name Protection.
What should you do?

A.
Change the zone type.

B.
Sign the zone.

C.
Add a DNSKEY record.

D.
Configure Dynamic updates.