You have a DNS server outside your corporate firewall that's a standalone Windows Server 2016 server. It hosts a primary zone for your public Internet domain name, which is different from your internal Active Directory domain names. You want one or more of your internal servers to be able to handle DNS queries for your public domain and to serve as a backup for the primary DNS server outside the firewall. Which configuration should you choose for internal DNS servers?

A. A standard secondary zone.
B. A standard stub zone.
C. A forwarder to point to the primary DNS server.
D. An Active Directory-integrated stub zone.