Utilize S3 Batch Operations with AWS Lambda to generate photo variants for different dimensions and resolutions, and implement a dynamic CloudFront origin for mapping device requests to the appropriate photo variant.

Employ S3 Batch Operations and AWS Lambda to produce photo variants, then use a Lambda@Edge function to direct requests to the correct photo variant using request headers.

Deploy a Lambda@Edge function for on-demand photo optimization and response delivery, and set CloudFront's TTL cache policy to its highest possible value.

Implement a Lambda@Edge function for real-time photo optimization and response, with processed photos stored on Amazon S3 for future requests.