Your company has a main office and a branch office. You discover that when you disable IPv4 on a computer in the branch office， the computer authenticates by using a domain controller in the main office. You need to ensure that IPv6-only computers authenticate to domain controllers in the same site. What should you do（）
- AConfigure the NTDS Site Settings object.
- BCreate Active Directory subnet objects.
- CCreate Active Directory Domain Services connection objects.
- DInstall an Intra-Site Automatic Tunnel Addressing Protocol （ISATAP） router.