Question 39
Domain 4: Billing, Pricing, and SupportWhich of the following activities may help reduce your AWS monthly costs?
Correct answer: A
Explanation
AWS cost optimization emphasizes “pay only for the resources your applications require” and “scale horizontally for resilience” without guessing capacity needs. Enabling EC2 Auto Scaling helps match compute capacity to demand, which supports the guide’s advice to “right size your resources” and reduce monthly spend.
Why each option is right or wrong
A. Enabling Amazon EC2 Auto Scaling for all of your workloads.
AWS cost optimization is explicitly tied to reducing spend by matching capacity to demand, and the Well-Architected guidance for reliability also says to avoid guessing capacity needs and scale horizontally. EC2 Auto Scaling automatically adds or removes instances based on demand, so you avoid paying for idle compute during low-traffic periods and can keep monthly EC2 charges closer to actual usage.
B. Using the AWS Network Load Balancer (NLB) to load balance the incoming HTTP requests.
C. Removing all of your Cost Allocation Tags.
D. Deploying your AWS resources across multiple Availability Zones.