You are designing a hub-and-spoke topology using virtual network peering and plan to make VNet1 the hub. The design must allow transitive routing between spokes and maximize network throughput. Which Azure service should you include in the hub?

Azure Firewall is the correct choice because it supports transitive routing between peered virtual networks, which is essential for a hub-and-spoke topology where spokes need to communicate through the hub. It also offers high throughput and scalability, crucial for maximizing network performance. Azure VPN Gateway primarily provides secure cross-premises connectivity and site-to-site VPNs, not optimized for transitive routing within Azure. Azure Route Server simplifies dynamic routing between NVAs and VNets but doesn't provide the firewall capabilities or direct transitive routing for spoke-to-spoke communication through the hub. Azure Private Link enables private connectivity to Azure services, not transitive routing between VNets.