Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam

The correct answer is Azure Monitor, as it plays a vital role in managing and optimizing the performance of Azure resources through its autoscale capabilities. Autoscale in Azure Monitor allows applications to automatically adjust the number of resources allocated based on current demand. This capability not only ensures that applications maintain optimal performance during varying workloads but also helps in minimizing costs by scaling down the resources when they are not needed.

With Azure Monitor, you can set up specific scaling rules based on metrics such as CPU usage, memory demand, or the number of requests, allowing for efficient resource management. This means you pay only for what you use, optimizing expenditure while ensuring performance is not compromised.

The other services, while important in their own contexts—such as providing insights into resource utilization or security recommendations—do not have the specific functionality of managing resource scaling in response to workload changes.