You have a Standard SKU Azure Container Registry named ContReg1. To enable geo-replication for ContReg1, what should you do first?

To enable geo-replication for an Azure Container Registry (ACR), the registry's SKU must be Premium. The Standard SKU does not support geo-replication. Therefore, the first step is to upgrade ContReg1 from Standard to Premium. Enabling the Admin user is for programmatic access and doesn't affect geo-replication. Adding a scope map or an automation task are features available in higher SKUs but are not prerequisites for enabling geo-replication itself. Creating a cache rule is a separate feature for pulling images faster from a remote registry, not for replicating the registry content.