- A
Enable consolidated billing under AWS Organizations so discounts and shared purchasing apply across accounts.
Correct. Consolidated billing centralizes purchasing and can improve discount usage across linked accounts. It also gives the company one payer view, which simplifies governance and visibility.
- B
Move each sandbox to its own payer account to isolate spend from the rest.
Why wrong: Incorrect. Splitting into separate payer accounts reduces pooling benefits and adds billing complexity. It makes central purchasing and consolidated visibility harder, not easier.
- C
Use managed services such as Amazon RDS or Amazon S3 instead of self-managed EC2-based databases and file servers where practical.
Correct. Managed services reduce the operational burden of patching, backups, and failover management. They often lower total cost of ownership even when raw infrastructure might look cheaper at first glance.
- D
Buy Dedicated Hosts for sandbox workloads to get a lower blended rate.
Why wrong: Incorrect. Dedicated Hosts are typically used for licensing or hardware isolation needs, not for cheaper sandbox environments. They usually increase cost and operational overhead.
- E
Disable AWS Budgets because consolidated billing already solves visibility.
Why wrong: Incorrect. Consolidated billing improves purchasing visibility, but it does not provide spend thresholds or alerts. Budgets remain useful for proactive cost control.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. 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 startup has three sandbox accounts and one production account. The CTO wants lower cost and operational overhead while keeping central purchasing and spend visibility. Which two actions are best? Select two.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Enable consolidated billing under AWS Organizations so discounts and shared purchasing apply across accounts.
Option A is correct because enabling consolidated billing under AWS Organizations aggregates usage across all accounts, allowing the startup to benefit from volume discounts, Reserved Instance sharing, and Savings Plans across the sandbox and production accounts. This reduces operational overhead by centralizing payment and provides a single view of spend, meeting the CTO's requirements for cost and visibility.
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.
- ✓
Enable consolidated billing under AWS Organizations so discounts and shared purchasing apply across accounts.
Why this is correct
Correct. Consolidated billing centralizes purchasing and can improve discount usage across linked accounts. It also gives the company one payer view, which simplifies governance and visibility.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Move each sandbox to its own payer account to isolate spend from the rest.
Why it's wrong here
Incorrect. Splitting into separate payer accounts reduces pooling benefits and adds billing complexity. It makes central purchasing and consolidated visibility harder, not easier.
- ✓
Use managed services such as Amazon RDS or Amazon S3 instead of self-managed EC2-based databases and file servers where practical.
Why this is correct
Correct. Managed services reduce the operational burden of patching, backups, and failover management. They often lower total cost of ownership even when raw infrastructure might look cheaper at first glance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Buy Dedicated Hosts for sandbox workloads to get a lower blended rate.
Why it's wrong here
Incorrect. Dedicated Hosts are typically used for licensing or hardware isolation needs, not for cheaper sandbox environments. They usually increase cost and operational overhead.
- ✗
Disable AWS Budgets because consolidated billing already solves visibility.
Why it's wrong here
Incorrect. Consolidated billing improves purchasing visibility, but it does not provide spend thresholds or alerts. Budgets remain useful for proactive cost control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might think Dedicated Hosts (Option D) reduce costs for sandbox workloads, but they actually increase costs due to per-host billing and are intended for specific licensing scenarios, not general cost optimization.
Detailed technical explanation
How to think about this question
Consolidated billing in AWS Organizations aggregates usage across member accounts, enabling the application of tiered pricing and volume discounts as if all accounts were a single customer. Reserved Instances and Savings Plans can be shared across accounts within an organization, but only if the RI sharing feature is enabled and the accounts are in the same billing family. Managed services like Amazon RDS and Amazon S3 offload patching, scaling, and backup management, reducing operational overhead compared to self-managed EC2 instances, which require manual OS and database maintenance.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable consolidated billing under AWS Organizations so discounts and shared purchasing apply across accounts. — Option A is correct because enabling consolidated billing under AWS Organizations aggregates usage across all accounts, allowing the startup to benefit from volume discounts, Reserved Instance sharing, and Savings Plans across the sandbox and production accounts. This reduces operational overhead by centralizing payment and provides a single view of spend, meeting the CTO's requirements for cost and visibility.
What should I do if I get this SAA-C03 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
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