An application needs to be set up on AWS. It consists of several components. Two primary components are required to run for 3 hours every day. During the three hours, the EC2 instances should always be in service for the components to run. The other components are required every day for more than 6-8 hours. Tasks of these components are less important and can be easily restored even if the EC2 instances are stopped. Which of the following would you use to ensure COSTS are minimized for the underlying EC2 Instances?

Answer options:

A.Reserved instances for the primary components and On-Demand Instances for the remaining components.
B.Spot instances for the primary components and On-Demand Instances for the remaining components.
C.On-Demand instances for the primary components and Spot Instances for the remaining components.
D.On-Demand instances for the primary components and Reserved Instances for the remaining components.

Answer – C
Options A and D are incorrect because reserved instances have one-year or three-year commitments and are not suitable in this scenario. The primary components only need to run 3 hours every day. It is not cost-efficient if reserved instances are used.
Option B is incorrect because primary components cannot use spot instances as they may impact the service.
Option C is CORRECT because on-demand instance ensures the stability of primary components while spot instances help to reduce the cost for the remaining components.