An Azure administrator wants to prevent important virtual machines from being accidentally deleted or modified during routine maintenance. Which feature should they use to ensure these resources remain unaffected by changes?
Azure Policy
Access Control (IAM)
Resource Locks
Role-Based Access Control (RBAC)
Resource locks can be applied at the subscription, resource-group, or individual-resource level. A CanNotDelete (Delete) lock stops deletion, and a ReadOnly lock stops both deletion and modification. Even users with Owner rights must first remove the lock before they can perform the blocked action, so a lock is an effective safeguard during maintenance.
Access Control (IAM) and Role-Based Access Control (RBAC) determine who can act on a resource, but a user who already has the necessary role could still delete or modify it. Azure Policy is intended for governance at scale; it can audit resources and, when configured with effects such as deny or denyAction, can block non-compliant operations. However, it is not designed as a quick, ad-hoc mechanism to freeze a single VM. For that scenario, a resource lock is the most direct solution.
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