AWS Certified Cloud Practitioner Practice Exam 2026 - Free AWS Practice Questions and Study Guide

The correct answer pertains to AWS Auto Scaling. This service assists in optimizing resource allocation by adjusting the number of running instances in response to demand, which can include moving instances between Availability Zones to maintain availability and performance.

AWS Auto Scaling allows for dynamic scaling, meaning it can automatically add or remove instances based on real-time metrics, such as CPU utilization or other custom metrics. One significant feature of this service is its ability to distribute instances evenly across multiple Availability Zones. By doing so, Auto Scaling enhances fault tolerance and improves the application’s availability.

The other options do not focus on the ability to move instances between Availability Zones for optimization purposes. For example, the EC2 Instance Scheduler is primarily for scheduling the start and stop of EC2 instances, while AWS Trusted Advisor provides best practices recommendations to optimize AWS environments, and AWS Migration Hub focuses on managing cloud migration projects rather than ongoing resource optimization.