Your company runs a three-tier application in the West Europe region. The middle tier consists of VMs spread across all three availability zones, and it must be reachable only from the front-end tier inside the same virtual network. You need to distribute traffic to the middle-tier VMs using an Azure Load Balancer whose availability is not tied to any single zone, and the load balancer must remain operational even if one entire zone fails. Which load balancer configuration meets these requirements?