From the Azure portal, you are configuring an Azure policy.

Comprehensive and Detailed 150 to 250 words of Explanation From [Cloud and AI Security Engineer/Course Guide/topics]:

The correct answer is DeployIfNotExists. A policy using the DeployIfNotExists effect can automatically deploy a required Azure resource or configuration when Azure Policy determines that the expected related resource does not exist or does not satisfy the policy ' s existence condition.

Because Azure Policy must actually perform an Azure Resource Manager deployment during remediation, the policy assignment requires a managed identity. Microsoft explicitly states that policy assignments using DeployIfNotExists require a managed identity to perform remediation. The identity can be system-assigned or user-assigned and must receive the Azure RBAC roles specified by the policy definition ' s roleDefinitionIds. Microsoft Learn

AuditIfNotExists checks whether a related resource exists and reports non-compliance but does not deploy anything, so no managed identity is required for the effect itself. Deny blocks a non-compliant create or update request, while Append adds defined fields to a request before it reaches the resource provider. Neither performs a remediation deployment requiring Azure authorization through a policy-assignment identity.

Therefore:

Correct answer: C. DeployIfNotExists

===============