You are developing an application that will be comprised of the following architecture -
1. A set of EC2 instances to process the messages.
2. These (EC2 instances) will be spun up by an Autoscaling group.
3. SQS Queues to maintain the processing messages.
4. There will be 2 pricing tiers.
How will you ensure that the premium customers’ messages are given more preference?

Answer options:

A.Create 2 Autoscaling Groups, one for normal and one for premium customers.
B.Create 2 sets of EC2 Instances, one for normal and one for premium customers.
C.Create 2 SQS queues, one for normal and one for premium customers.
D.Create 2 Elastic Load Balancers, one for normal and one for premium customers.

Answer – C
The ideal option would be to create 2 SQS queues. Messages can then be processed by the application from the high priority queue first.
Option A is incorrect because 2 Auto Scaling groups will still launch the same set of EC2 instances that are defined in the Launch Configuration/Template.
Option B is incorrect because launching 2 sets of EC2 instances involves lots of manual work.
Option D is incorrect because having 2 ELB will still require a different set of EC2 instances. 
For more information on SQS, please refer to the below Link-
https://aws.amazon.com/sqs/