A Solutions

Architect is designing a mobile application that will capture receipt images to track expenses. The Architect wants to store the images on Amazon S3. However, uploading images through the web server will create too much traffic.

What is the MOST efficient

method to store images from a mobile application on Amazon S3?

A. Upload directly to S3 using a pre-signed URL.

B. Upload to a second bucket, and have a Lambda event copy the image to the primary bucket.

C. Upload to a separate Auto Scaling group of serve

rs behind an ELB Classic Load Balancer, and have them write to the Amazon S3 bucket.

D. Expand the web server fleet with Spot Instances to provide the resources to handle the images.