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 server role and are 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（）
- ARun the Ntdsutil.exe DS Behavior commands on DC3.
- BRun the Dnscmd.exe /ZoneResetType command on DC3.
- CReinstall Active Directory Domain Services on DC3 as a writable domain controller.
- DCreate a custom application directory partition on DC1. Configure the partition to store Active Directory-integrated z