You plan to deploy an Azure Firewall named AF1 into resource group RG1 in the West US region. Given the virtual networks in your subscription (as shown in the scenario table), into which virtual network(s) can AF1 be deployed?

Azure Firewall requires a dedicated subnet named AzureFirewallSubnet within the virtual network where it's deployed. This subnet must have a /26 or larger CIDR range. From the provided scenario, only Vnet1 has a subnet named AzureFirewallSubnet with a /26 CIDR. Vnet2, Vnet3, and Vnet4 either lack a subnet with the required name or do not meet the CIDR size requirement for the AzureFirewallSubnet. Therefore, AF1 can only be deployed into Vnet1.