Your company is running a premium photo-sharing application. Users can upload their creative photos and license them to be used by others. The application allows the users to watermark and do other signatures before the images can be visible to everyone in the public stream. The watermarking and signature are based on the user-selected plan and allowed to do a certain number of images in a given timeframe. Along with this, the company has collaborated with some users and groups. They are allowed to process images faster compared to others whenever they submit their images.

Answer options:

A.Use SQS queues instead of Lambda Trigger. Use the priority order messages to process the images.
B.Save the processing information to DynamoDB before saving the image to S3. When the AWS Lambda trigger runs, pull the information from DynamoDB and process accordingly.
C.Use two SQS queues instead of Lambda Trigger. One with high priority messages and another for the low priority messages. Check for the messages into the high priority queue before processing any messages from the low priority queue.
D.Use the AWS Batch to create jobs with priority job queues and use the combination of EC2 On-Demand and Spot instances to process the messages.

Correct Answer: C
Option A is INCORRECT because while the SQS will definitely help decouple and streamline the message processing. It will still not be processed any desired order. The consumer application will receive the SQS queue messages and will have to use the additional logic to schedule and prioritize the processing.
Option B is INCORRECT because just saving the processing information to the DynamoDB will not help in the scheduling or ordering the messages. The customer application will still receive the message from the SQS in a different order and will have to run the appropriate logic to schedule the tasks.
Option C is CORRECT because it always allows the consumer to check the premium queue first. If the premium queue is empty, it will pull from the member queue, satisfying both the requirements to re-architect and processing some images before others. You can also scale your EC2 instances, processing the images based on need as well. 
Please refer to the following link- 
https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-using-sqs-queue.html 
Option D is INCORRECT because using AWS Batch to create jobs is not necessary here.