You have a video processing application hosted in AWS. The videos are uploaded by users onto the site. You have a program that is custom-built and runs in the background anytime to process those videos. The program can recover in case there are any failures when processing the videos. Which of the following mechanisms can be used to deploy the instances for carrying out the video processing activities, ensuring that the cost is kept at a minimum?

Answer options:

A.Create a launch configuration with Reserved Instances. Ensure the User Data section details the installation of the custom software. Create an Autoscaling group with the launch configuration.
B.Create a launch configuration with Spot Instances. Ensure the User Data section details the installation of the custom software. Create an Autoscaling group with the launch configuration.
C.Create a launch configuration with Dedicated Instances. Ensure the User Data section details the installation of the custom software. Create an Autoscaling group with the launch configuration.
D.Create a launch configuration with On-Demand Instances. Ensure the User Data section details the installation of the custom software. Create an Autoscaling group with the launch configuration.

Answer – B
Since the application can recover from failures and cost is the priority, then Spot instances are the best bet for this requirement. The launch configuration has the facility to request Spot Instances.
The below snapshot from the Launch configuration section shows that Spot Instances can be used for AutoScaling Groups.
For more information on Spot Instances and Autoscaling, please visit the below URL:
http://docs.aws.amazon.com/autoscaling/latest/userguide/US-SpotInstances.html