Your company has a single Active Directory forest that has an Active Directory domain named na.contoso. com A member server named Server2 runs the DNS server role. The Server2 DNS service hosts multiple secondary zones including na.contoso.com. You need to reconfigure Server2 as a caching-only DNS server. What should you do（）

• A、 Uninstall and reinstall the DNS service on Server2
• B、 Change all the DNS zones on Server2 to stub zones
• C、 Disable and then enable the DNS service on Server2
• D、 Delete the na.contoso.com DNS zone domain from Server2. Restart the DNS service on Server2.