- A
On-Demand Instances
Why wrong: On-Demand Instances provide flexibility and no upfront commitment, but they are the most expensive option for continuous usage. This model does not minimize costs for predictable workloads.
- B
Reserved Instances
Reserved Instances offer a substantial discount over On-Demand for a commitment of one or three years. They are ideal for steady-state, continuously running workloads because they lower costs without sacrificing availability.
- C
Spot Instances
Why wrong: Spot Instances offer the largest discount but can be interrupted with short notice. They are not suitable for production workloads that require continuous availability.
- D
Dedicated Hosts
Why wrong: Dedicated Hosts provide physical server isolation for licensing or compliance requirements, but they do not inherently offer a cost discount. They are typically more expensive than On-Demand or Reserved Instances for the same capacity.
Quick Answer
Reserved Instances are the correct choice for minimizing compute costs on continuous, predictable production workloads. This pricing model offers a significant discount—up to 72% off On-Demand rates—in exchange for a 1- or 3-year commitment, making it ideal for always-on EC2 instances with steady usage patterns. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of cost optimization strategies: when a workload is both continuous and predictable, Reserved Instances directly align with the need to reduce expenses without sacrificing availability. A common trap is choosing On-Demand or Spot Instances—On-Demand lacks the discount, while Spot Instances can be interrupted, making them unsuitable for continuous production. Remember the memory tip: “Reserved for regular, reliable runs”—if the workload never sleeps and you can commit, Reserved Instances deliver the deepest savings.
CLF-C02 Billing, Pricing, and Support Practice Question
This CLF-C02 practice question tests your understanding of billing, pricing, and support. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 a production workload on Amazon EC2 instances that must be available continuously. The workload has predictable usage patterns. The company wants to minimize compute costs while maintaining high availability. Which pricing model should they choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Reserved Instances
Reserved Instances (RIs) are the correct choice because the workload requires continuous availability and has predictable usage patterns. By committing to a 1- or 3-year term, the company can receive a significant discount (up to 72%) compared to On-Demand pricing, while still ensuring the EC2 instances are always running and highly available. This model directly aligns with the need to minimize compute costs for a steady-state, always-on production workload.
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 provide flexibility and no upfront commitment, but they are the most expensive option for continuous usage. This model does not minimize costs for predictable workloads.
- ✓
Reserved Instances
Why this is correct
Reserved Instances offer a substantial discount over On-Demand for a commitment of one or three years. They are ideal for steady-state, continuously running workloads because they lower costs without sacrificing availability.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Spot Instances
Why it's wrong here
Spot Instances offer the largest discount but can be interrupted with short notice. They are not suitable for production workloads that require continuous availability.
- ✗
Dedicated Hosts
Why it's wrong here
Dedicated Hosts provide physical server isolation for licensing or compliance requirements, but they do not inherently offer a cost discount. They are typically more expensive than On-Demand or Reserved Instances for the same capacity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose On-Demand Instances because they assume 'continuous availability' requires the flexibility of no commitment, overlooking that Reserved Instances provide the same availability at a much lower cost for predictable workloads.
Detailed technical explanation
How to think about this question
Reserved Instances are not a physical instance type but a billing discount applied to the On-Demand usage of EC2 instances in a specific Availability Zone (for zonal RIs) or region (for regional RIs). The discount is applied automatically when the instance attributes (instance family, tenancy, platform) match the reservation. For a production workload with predictable usage, Standard RIs offer the highest discount, and if the workload spans multiple Availability Zones for high availability, a regional RI can cover the aggregate usage without requiring a specific AZ assignment.
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: Reserved Instances — Reserved Instances (RIs) are the correct choice because the workload requires continuous availability and has predictable usage patterns. By committing to a 1- or 3-year term, the company can receive a significant discount (up to 72%) compared to On-Demand pricing, while still ensuring the EC2 instances are always running and highly available. This model directly aligns with the need to minimize compute costs for a steady-state, always-on production workload.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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