You will deploy an Azure Firewall AF1 to resource group RG1 in the West US region. Given the virtual networks in the subscription, to which virtual networks can AF1 be deployed?

Azure Firewall must be deployed in its own dedicated subnet named AzureFirewallSubnet within a virtual network. This subnet must have a /26 or larger CIDR range. VNET1 is the only virtual network listed that contains a subnet named AzureFirewallSubnet. Therefore, AF1 can only be deployed to VNET1. VNET2, VNET3, and VNET4 lack the required AzureFirewallSubnet, making them unsuitable for direct Azure Firewall deployment.