Hotspot Question
Your network contains an Active Directory domain named contoso.com. The domain contains a
DNS server named Server1. Server1 configured to use a forwarder named server2.contoso.com
that has an IP address of 10.0.0.10. You need to prevent Server1 from using root hints if the
forwarder is unavailable. What command should you run? (To answer, select the appropriate
options in the answer area.)
Answer: 
Correct.
https://docs.microsoft.com/en-us/powershell/module/dnsserver/set-dnsserverforwarder?view=win10-ps