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The engineering team at CloudTail, an online retail company, needs to enhance their ecommerce platform on AWS due to security vulnerabilities and performance issues. The web application is hosted as a static website on Amazon S3 with Amazon CloudFront for content delivery, Amazon API Gateway invokes AWS Lambda functions to handle user requests and order processing, and the Lambda functions store data in an Amazon RDS for MySQL DB cluster that uses On-Demand instances with consistent usage in the past 12 months. The website has experienced SQL injection and web exploit attempts, customers also report that order processing time has increased during periods of peak usage, and during these periods, the Lambda functions often have cold starts, thus as the company grows, they need to ensure scalability and low-latency access during traffic peaks, optimize the database costs, and add protection against the SQL injection and web exploit attempts. Which solution will meet these requirements?