Question 29
Domain 1: Design Solutions for Organizational ComplexityA solutions architect needs to reduce compute costs for workloads with different usage patterns. Which AWS purchasing option is most appropriate for fault-tolerant workloads that can tolerate interruptions?
Correct answer: C
Explanation
Use Spot Instances for workloads that can handle interruptions, and use Reserved Instances or Savings Plans for more predictable, longer-term usage commitments. — AWS Certified Solutions Architect - Professional Exam Guide: AWS purchasing options (for example, Reserved Instances, Savings Plans, Spot Instances)
Why each option is right or wrong
A. Reserved Instances for workloads that need a lower price through a commitment to steady usage
Reserved Instances are intended for committed usage patterns, not interruption-tolerant capacity.
B. Savings Plans for workloads that need flexible pricing based on committed long-term usage
Savings Plans apply to committed usage spending, not workloads selected because they can be interrupted.
C. Spot Instances for workloads that can continue operating even if capacity is interrupted
The question asks for the purchasing option suited to fault-tolerant workloads that can tolerate interruptions. Among the listed AWS purchasing options in the exam guide—Reserved Instances, Savings Plans, and Spot Instances—Spot Instances are the option associated with interruptible capacity, making them the best fit for this workload pattern.
D. Reserved Instances for workloads that need temporary capacity without any long-term planning
Reserved Instances are based on planning for longer-term usage, not temporary interruptible capacity needs.