A developer accidentally deleted a virtual machine. Which feature would help prevent accidental deletions?

Lock resource is correct because it prevents accidental deletion or modification of Azure resources. You can apply "CanNotDelete" or "ReadOnly" locks to subscriptions, resource groups, or individual resources like virtual machines. Resource tags are incorrect because they are used for organizing resources and managing costs, not for preventing deletions. Azure Monitor is incorrect because it collects and analyzes telemetry data for monitoring performance and health, not for preventing resource changes. Activity Log is incorrect because it records events that occurred in the subscription, such as resource deletions, but it does not prevent them.