How can the solutions architect meet this requirement?
Deploy Amazon API Gateway into a public subnet and adjust the route table to route S3 calls through it.
Deploy a NAT gateway into a public subnet and attach an endpoint policy that allows access to the S3 buckets.
Deploy the application into a public subnet and allow it to route through an internet gateway to access the S3 buckets.
Deploy an S3 VPC gateway endpoint into the VPC and attach an endpoint policy that allows access to the S3 buckets.
Explanations:
Deploying Amazon API Gateway in a public subnet does not reduce data transfer costs for S3 access and introduces additional complexity and latency for the application. API Gateway is not designed for this use case.
A NAT gateway is used for allowing outbound internet access for resources in a private subnet, but it does not directly reduce data transfer costs for S3 access within the same region. It could potentially increase costs due to data processing fees.
Deploying the application into a public subnet with internet access does not optimize data transfer costs to S3. Instead, it exposes the application to the public internet, which is not a best practice for security and may incur additional data transfer charges.
Deploying an S3 VPC gateway endpoint allows private communication between the VPC and S3 without going over the public internet, reducing data transfer costs and improving security. The endpoint policy ensures access control to the S3 buckets.
I would say the answer is:
Deploy an S3 VPC gateway endpoint into the VPC and attach an endpoint policy that allows access to the S3 buckets.