You manage a two-node Always On availability group spread across two Azure regions using SQL Server on Azure VMs. The primary is in East US and the secondary is in West US. During a recent East US zone disruption, the Windows Server Failover Cluster lost quorum and both nodes went offline even though the West US node was healthy. You need to choose a quorum configuration that keeps the cluster online when a single region or node is lost, while minimizing cost and administrative overhead. What should you configure?