A company runs a high-traffic web application that has a three-tier architecture consisting of a...

The correct answers areA, B, and Cbecause the company needs to handle a sharp increase inread traffic, maintainhigh availability, and avoidapplication changes. These three options improve scaling at different layers of the architecture while remaining aligned with the current application design.

A. Amazon CloudFronthelps reduce load on the web tier by caching content closer to users at edge locations. This improves responsiveness and reduces the number of requests that must reach the origin web servers during the marketing event. It is a common way to scale web traffic without changing the application.

B. Auto Scaling for the application layeris also appropriate because the application layer is already described asstatelessand supports automatic scaling. Adding or removing EC2 instances based on demand helps the application remain responsive under high load.

C. Amazon Aurora with Aurora Replicas and Aurora Auto Scalingis the best way to scale the relational database layer for read-heavy workloads. Aurora Replicas can offload read traffic from the writer instance, and Aurora Auto Scaling can automatically adjust replica capacity based on demand. This preserves the relational architecture while improving read scalability and availability.

OptionDcan reduce database read pressure, but adding ElastiCache effectively requires the application to use the cache, which conflicts with the requirement to avoid modifying the application. OptionEis incorrect because replacing the ALB with an NLB does not solve the application’s scaling or read-traffic bottlenecks. OptionFis incorrect because migrating from a relational database to DynamoDB would require a major redesign.

So the best combination isCloudFront,Auto Scaling for the stateless application tier, andAurora with read scaling features.