AWS Certified Cloud Practitioner — Question 99

An ecommerce company wants to use Amazon EC2 Auto Scaling to add and remove EC2 instances based on CPU utilization.
Which AWS service or feature can initiate an Amazon EC2 Auto Scaling action to achieve this goal?

Answer options

• A. Amazon Simple Queue Service (Amazon SQS)
• B. Amazon Simple Notification Service (Amazon SNS)
• C. AWS Systems Manager
• D. Amazon CloudWatch alarm

Correct answer: D

Explanation

The correct answer is D, Amazon CloudWatch alarm, because it monitors metrics and can trigger actions based on defined thresholds. The other options, such as Amazon SQS and Amazon SNS, do not provide the necessary functionality to directly initiate Auto Scaling actions based on CPU utilization.