- A
On-Demand Instances
Why wrong: On-Demand Instances have no discount. For flexible, interruptible batch jobs, On-Demand is unnecessarily expensive.
- B
Reserved Instances
Why wrong: Reserved Instances require 1- or 3-year commitments. For batch jobs that run only occasionally, committing to reserved capacity wastes money and is not the lowest-cost option.
- C
Spot Instances
Spot Instances use spare AWS capacity at discounts up to 90%. Since the batch jobs can be paused and restarted when interrupted, they are perfectly suited for Spot, achieving the lowest possible compute cost.
- D
Dedicated Instances
Why wrong: Dedicated Instances run on hardware dedicated to a single customer for isolation purposes. They carry a premium over standard On-Demand pricing and are not the lowest-cost option.
Quick Answer
The answer is Spot Instances, as they provide the lowest possible cost for interruptible batch workloads by leveraging spare AWS EC2 capacity at discounts of up to 90% off On-Demand pricing. This is correct because the company’s non-critical batch analytics jobs can be paused and restarted if interrupted, and they are flexible regarding when they run—exactly the use case Spot Instances are designed for, with a two-minute warning before AWS reclaims the capacity. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of EC2 purchasing options and cost optimization for fault-tolerant, interruptible workloads. A common trap is confusing Spot Instances with Reserved Instances, which offer lower costs for steady-state usage but lack interruption flexibility. Remember the memory tip: “Spot for stop-and-go, Reserved for round-the-clock.”
CLF-C02 Billing, Pricing, and Support Practice Question
This CLF-C02 practice question tests your understanding of billing, pricing, and support. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs non-critical batch analytics jobs that can be paused and restarted if interrupted. The jobs are flexible regarding when they run. Which EC2 purchasing option offers the lowest possible cost for this workload?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Spot Instances
Spot Instances offer the lowest possible cost because they use spare AWS EC2 capacity at a steep discount (up to 90% off On-Demand). Since the batch analytics jobs are non-critical, can be paused and restarted, and are flexible regarding when they run, they are an ideal fit for Spot Instances, which can be interrupted with a 2-minute warning when capacity is reclaimed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
On-Demand Instances
Why it's wrong here
On-Demand Instances have no discount. For flexible, interruptible batch jobs, On-Demand is unnecessarily expensive.
- ✗
Reserved Instances
Why it's wrong here
Reserved Instances require 1- or 3-year commitments. For batch jobs that run only occasionally, committing to reserved capacity wastes money and is not the lowest-cost option.
- ✓
Spot Instances
Why this is correct
Spot Instances use spare AWS capacity at discounts up to 90%. Since the batch jobs can be paused and restarted when interrupted, they are perfectly suited for Spot, achieving the lowest possible compute cost.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Dedicated Instances
Why it's wrong here
Dedicated Instances run on hardware dedicated to a single customer for isolation purposes. They carry a premium over standard On-Demand pricing and are not the lowest-cost option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Reserved Instances thinking they always provide the best discount, but they fail to recognize that Spot Instances can be even cheaper for fault-tolerant, flexible workloads that can handle interruptions.
Detailed technical explanation
How to think about this question
Spot Instances are priced based on real-time supply and demand for EC2 capacity, and the interruption behavior is governed by the EC2 Spot service, which sends a two-minute Rebalance Recommendation before termination. For batch analytics, you can use a Spot Instance with a termination notice handler to checkpoint job state to Amazon S3, then resume on a new Spot Instance when capacity returns. AWS also offers Spot Blocks (now called Capacity Blocks for ML) for a guaranteed duration of 1–6 hours, but for lowest cost, standard Spot Instances with interruption handling are optimal.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Billing, Pricing, and Support — This question tests Billing, Pricing, and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Spot Instances — Spot Instances offer the lowest possible cost because they use spare AWS EC2 capacity at a steep discount (up to 90% off On-Demand). Since the batch analytics jobs are non-critical, can be paused and restarted, and are flexible regarding when they run, they are an ideal fit for Spot Instances, which can be interrupted with a 2-minute warning when capacity is reclaimed.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.
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