You are building a web application hosted on AWS that experiences significant traffic fluctuations throughout the day. During peak hours, it uses several EC2 instances with on-demand billing. Additionally, you store large video files in Amazon S3 buckets that are infrequently accessed. You are looking to optimize your AWS costs without compromising performance or data availability. Which combination of AWS services and strategies would achieve the most cost-effective solution for this scenario?

Implement Auto Scaling with Reserved EC2 Instances and leverage S3 Intelligent-Tiering to automatically move less accessed video files to a low-cost storage class.

Utilize Reserved Instances for your core EC2 instances and leverage S3 Intelligent-Tiering to automatically move less accessed video files to a cheaper storage class.

Implement AWS Fargate with serverless containers for your web application and utilize Amazon SQS for queueing asynchronous tasks, then move infrequently accessed video files to Amazon FSx for Lustre for cost-effective high-performance access.

Use AWS Lambda functions triggered by Amazon API Gateway for your web application logic and store video files in Amazon EBS volumes attached to your EC2 instances, utilizing EBS snapshots for backups and disaster recovery.

Correct Option - a

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