An organization has two Amazon EC2 instances: - The first is running an ordering application and an inventory application. The second is running a queuing syste...

An organization has two Amazon EC2 instances:
- The first is running an ordering application and an inventory application.
The second is running a queuing system.
During certain times of the year, several thousand orders are placed per second. Some orders were lost when the queuing system was down. Also, the organization's inventory application has the incorrect quantity of products because some orders were processed twice.
What should be done to ensure that the applications can handle the increasing number of orders?