Question
An e-learning platform needs to run an application for 2 months each year. The application will be deployed on Amazon EC2 instances. Any application downtime during those 2 months must be avoided.
Which EC2 purchasing option will meet these requirements MOST cost-effectively?
- A. Reserved Instances
- B. Dedicated Hosts
- C. Spot Instances
- D. On-Demand Instances Correct
Explanation
On-Demand Instances are billed only for the time they run, with no long-term commitment, and are not interrupted by AWS, so they suit a workload that runs for only 2 months a year and must avoid downtime. Reserved Instances require a 1-year or 3-year commitment, so paying for a full year to use 2 months is not cost-effective. Dedicated Hosts are physical servers dedicated to one customer and cost more. Spot Instances are cheaper but can be interrupted by AWS with a two-minute warning, which risks downtime.
