An Azure DNS Private Resolver operates within a specific virtual network (VNet). Its ability to resolve hostnames for an Azure Private DNS Zone is contingent upon a virtual network link existing between the resolver's VNet and the private zone. The resolver can only process queries for zones that are explicitly linked to its VNet.

Assuming the context of the question implies that only the Zone1.com private DNS zone is linked to the virtual network where the Azure DNS Private Resolver is deployed, then the resolver can only perform name resolution for that specific zone. Queries for Zone2.com and Zone3.com would fail as no VNet link exists for them.

B, C, D, E: These options are incorrect because they include Zone2.com and/or Zone3.com. Based on the scenario, these zones lack the required virtual network link to the resolver's VNet, making them unresolvable by it.

1. Microsoft Learn

"What is Azure DNS Private Resolver?": Under the "How it works" section

the documentation states

"The resolver can resolve DNS queries for Azure DNS private zones that are linked to the virtual network where the resolver is provisioned." This directly supports the requirement of a VNet link for resolution.

2. Microsoft Learn

"Azure Private DNS zone scenarios": In the "Name resolution" section

it is specified that

"To resolve records in a private DNS zone from your virtual network

you must link the virtual network to the zone." This confirms that the link is a prerequisite for any resolution within the VNet

including by a private resolver.