- A
On-Demand Instances
Why wrong: On-Demand provides immediate availability with no interruption, but at the highest per-hour cost — not the lowest cost option.
- B
Reserved Instances (1-year, No Upfront)
Why wrong: Reserved Instances require a 1 or 3-year commitment — inappropriate for unpredictable short-lived workloads that may not run consistently enough to justify the commitment.
- C
Spot Instances
Spot Instances offer up to 90% discount for interruptible workloads. Batch jobs that can checkpoint and resume are the ideal fit — they tolerate interruption in exchange for the lowest possible compute cost.
- D
Dedicated Hosts
Why wrong: Dedicated Hosts are the most expensive EC2 option, used for license compliance with software that requires dedicated physical servers.
Quick Answer
The answer is Spot Instances, which are the cheapest EC2 purchasing option for interruptible batch workloads because they let you leverage unused AWS capacity at discounts of up to 90% off On-Demand pricing. Since your batch jobs are short-lived and can tolerate interruption, Spot Instances are ideal—they can be reclaimed by AWS with a two-minute warning, but for fault-tolerant workloads like these, that risk is acceptable and the cost savings are massive. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of the four main purchasing models (On-Demand, Reserved, Spot, and Dedicated Hosts), and a common trap is choosing On-Demand because it seems simpler, but the key phrase “interruptible” or “can be interrupted” always points to Spot. For a quick memory tip, think “Spot the savings for stop-and-go jobs”—if your workload can stop and restart, Spot is the spot-on choice for lowest cost.
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 has unpredictable, short-lived batch processing workloads that can be interrupted. Which EC2 purchasing option would provide the lowest cost for these workloads?
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 (Option C) are the correct choice because they offer unused EC2 capacity at steep discounts (up to 90% off On-Demand) and are ideal for fault-tolerant, flexible, short-lived, or interruptible workloads. Since the company's batch processing jobs are unpredictable and can be interrupted, Spot Instances provide the lowest cost while tolerating the risk of termination when AWS needs the capacity back.
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 provides immediate availability with no interruption, but at the highest per-hour cost — not the lowest cost option.
- ✗
Reserved Instances (1-year, No Upfront)
Why it's wrong here
Reserved Instances require a 1 or 3-year commitment — inappropriate for unpredictable short-lived workloads that may not run consistently enough to justify the commitment.
- ✓
Spot Instances
Why this is correct
Spot Instances offer up to 90% discount for interruptible workloads. Batch jobs that can checkpoint and resume are the ideal fit — they tolerate interruption in exchange for the lowest possible compute cost.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Dedicated Hosts
Why it's wrong here
Dedicated Hosts are the most expensive EC2 option, used for license compliance with software that requires dedicated physical servers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose On-Demand Instances (Option A) because they assume 'unpredictable' workloads require full pricing flexibility, but they overlook that Spot Instances are explicitly designed for interruptible, short-lived workloads at the lowest cost.
Detailed technical explanation
How to think about this question
Spot Instances operate on a bidding model where you specify a maximum price per instance-hour, and AWS reclaims the instance with a 2-minute warning when the Spot price exceeds your bid or capacity is needed. For batch processing, you can design the application to checkpoint progress to Amazon S3 or EFS, allowing seamless resumption after interruption. The Spot Instance interruption notice is delivered via the instance metadata and Amazon EventBridge, enabling graceful shutdown logic.
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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Billing, Pricing, and Support — study guide chapter
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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 (Option C) are the correct choice because they offer unused EC2 capacity at steep discounts (up to 90% off On-Demand) and are ideal for fault-tolerant, flexible, short-lived, or interruptible workloads. Since the company's batch processing jobs are unpredictable and can be interrupted, Spot Instances provide the lowest cost while tolerating the risk of termination when AWS needs the capacity back.
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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