AWS Certified Cloud Practitioner — Question 867

A company’s application has high customer usage during certain times of the day. The company wants to reduce the number of Amazon EC2 instances that run when application usage is low.

Which AWS service or instance purchasing option should the company use to meet this requirement?

Answer options

• A. EC2 Instance Savings Plans
• B. Spot Instances
• C. Reserved Instances
• D. Amazon EC2 Auto Scaling

Correct answer: D

Explanation

Amazon EC2 Auto Scaling dynamically adjusts the number of EC2 instances in response to changing demand, allowing the company to scale down during low-usage hours to save costs. In contrast, EC2 Instance Savings Plans, Reserved Instances, and Spot Instances are purchasing models that offer cost discounts but do not automatically scale instance counts up or down based on real-time traffic.