Your company has a main office and a branch office.The company has a single-domain Active Directory forest.
The main office has two domain controllers named DC1 and DC2 that run Windows Server 2008 R2. The
branch office has a Windows Server 2008 R2 read-only domain controller (RODC) named DC3.
All domain controllers hold the DNS Server role andare configured as Active Directory-integrated zones. The
DNS zones only allow secure updates.
You need to enable dynamic DNS updates on DC3.
What should you do?

A.
Run the Dnscmd.exe /ZoneResetType command on DC3.

B.
Reinstall Active Directory Domain Services on DC3as a writable domain controller.

C.
Create a custom application directory partition on DC1. Configure the partition to store Active Directory-integrated zones.

D.
Run the Ntdsutil.exe > DS Behavior commands on DC3.