Boot Method Option Does Not Exist as Stated in DNS Manager Help
Configuring Internal DNS Server when Using Microsoft Proxy Server
Windows NT DNS Server can be configured to boot either from the registry or from
a boot file. But, to change the default behavior, you must edit the registry.
Initially, DNS will boot from the boot file. But as soon as you use DNS Manager
to create or modify a zone, DNS will automatically be configured to boot from
the registry: Q177120