Microsoft Certified: Azure Fundamentals (AZ-900) 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer is the feature that allows for the automatic scaling of virtual machines based on demand, which is the Virtual Machine Scale Set. This feature is specifically designed to manage a group of identical, load-balanced VMs and provides the ability to automatically increase or decrease the number of VM instances as demand rises or falls. This ensures that applications have the necessary resources when traffic spikes and can scale back during quieter times, optimizing performance while also controlling costs.

Other options serve different purposes that do not involve automatic scaling. For instance, a Virtual Network facilitates private communication between Azure resources, allowing them to connect securely. Load Balancer distributes incoming network traffic across multiple resources to ensure no single VM is overwhelmed, improving availability but not directly handling scaling. Availability Zones provide redundancy and fault tolerance by spreading resources across different physical locations within a region, enhancing resilience but not addressing scaling specifically.