Expand “Forward Lookup Zones”, and right click on “EXAMPLE.com
Create the “gslb” subdomain.
Step through the Delegation Wizard. Add “ns1.example.com - 203.0.113.8”
Also add “ns2.example.com - 198.51.100.40”
Make sure both ns1.example.com and ns2.example.com are added
Click “Finish”