NS records will be used to list authoritative DNS servers for the zone. In an AD-integrated DNS setup, all the domain controllers with the DNS role installed will be added to the nameserver records in the zone file. Having multiple nameservers will add redundancy to the DNS setup.

The following command can list down the nameservers for a zone. REBELADMIN.COM can be replaced with any zone name:

Get-DnsServerResourceRecord -ZoneName "REBELADMIN.COM" -RRType "NS"