1. The DNS Server service must be configured with root hints to resolve queries for names that is not authoritative for or for which it contains no delegations. (What does 'that' refer to and what does ' which' refer to?
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MrPedanticI wonder if there should be an extra "it":
1. The DNS Server service must be configured with root hints to resolve queries for names that it is not authoritative for or for which it contains no delegations.
I think that you're quite right about the original version.