How should you implement such a system?

Your application provides data transformation services. Files containing data to be transformed are first uploaded to Amazon 53 and then transformed by a fleet of spot EC2 instances. Fi les submitted by your premium customers must be transformed with the highest priority.

How should you implement such a system?
A . Use a DynamoDB table with an attribute defining the priority level. Transformation instances will scan the table for tasks, sorting the results by priority level.
B . Use Route 53 latency based-routing to send high priority tasks to the closest transformation instances.
C . Use two SQS queues, one for high priority messages, the other for default priority. Transformation instances first poll the high priority queue; if there is no message, they poll the default priority queue.
D . Use a single SQS queue. Each message contains the priority level. Transformation instances poll high-priority messages first.

Answer: C