Final answer:
To view which user turned off a specific VM in Azure during the last 14 days, one should use Azure Activity Log within the Azure Monitor service. This log provides details on operations performed, the individuals involved, and the timing of such activities.
Step-by-step explanation:
To view which user turned off a specific Virtual Machine (VM) during the last 14 days in Azure, you would use Azure Activity Log, which is a part of the Azure Monitor service. The Azure Activity Log provides data about operations that were performed in Azure, including who performed the operation and when it was performed. To track who turned off a VM, you would filter the activity log for the 'Deallocate' or 'Stop' operation for the specified VM within the desired timeframe.
Neither Azure Security Center, Azure Log Analytics, nor Azure Active Directory directly provide this information as their primary focus is different. Azure Security Center focuses on security management and threat protection, Azure Log Analytics is more about collecting and analyzing data from various resources, and Azure Active Directory focuses on identity services rather than operational logs.