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A company runs a serverless ecommerce application on AWS.

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A company runs a serverless ecommerce application on AWS. The application uses API Gateway to invoke Java Lambda functions that connect to an Amazon RDS for MySQL database. During a sale event, traffic spikes caused slow performance and DB connection failures.

Which solution will improve performance with the LEAST application change?

A.

Move DB connection outside Lambda handler and increase provisioned concurrency.

B.

Use RDS Proxy. Store DB credentials in Secrets Manager. Update Lambda to use RDS Proxy. Increase provisioned concurrency.

C.

Increase max_connections parameter in a custom DB parameter group and reboot. Increase reserved concurrency.

D.

Use RDS Proxy and Secrets Manager. Increase reserved concurrency.

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