SAA-C03 Design Cost-Optimized Architectures Practice Question
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.
⚠ Common exam trap
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.
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 AWS Organizations consolidated billing places all four accounts under a single payer account, which aggregates usage for volume discounts (such as S3 tiered pricing and Reserved Instance/Savings Plans sharing), centralizes purchasing, and provides a single bill for spend visibility — exactly matching the CTO's goals of lower cost, less overhead, and central purchasing. Option C is correct because replacing self-managed EC2-based databases and file servers with managed services like Amazon RDS and Amazon S3 reduces operational overhead (patching, backups, scaling handled by AWS) and typically lowers total cost, aligning with the startup's desire to minimize operational burden. Option B is wrong because separate payer accounts fragment billing, forfeit volume discounts and RI/SP sharing, and increase overhead rather than reduce it. Option D is wrong because Dedicated Hosts are a premium-priced option intended for licensing/compliance needs, not a cost-saving measure for sandbox workloads. Option E is wrong because AWS Budgets is a free cost-visibility and alerting tool; disabling it removes the very spend visibility the CTO wants, and consolidated billing alone does not provide budget alerts or thresholds.
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
Consolidated billing under AWS Organizations pools usage across all four accounts, so volume discounts and Savings Plans apply to aggregate spend rather than per-account totals. This directly satisfies the CTO's lower-cost and central-purchasing requirements, while the management account retains unified spend visibility without extra tooling.
- ✗
Move each sandbox to its own payer account to isolate spend from the rest.
Why it's wrong here
Separate payer accounts multiply billing overhead and fragment the central purchasing and spend visibility the CTO wants. A single organisation with consolidated billing aggregates invoices and volume discounts across accounts. Per-account payers suit fully independent businesses needing strict billing separation, not one startup's sandboxes.
When this WOULD be correct
If the CTO required strict cost isolation between accounts (e.g., for regulatory compliance or chargeback to different departments) and did not need central purchasing or consolidated discounts, then separate payer accounts would be appropriate.
- ✓
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
Replacing self-managed EC2 databases and file servers with Amazon RDS and Amazon S3 removes patching, replication and capacity chores, directly cutting the operational overhead the CTO wants reduced. Consumption-based pricing also lowers sandbox running costs, since idle instances stop billing, while production retains durability and central spend visibility through consolidated billing.
- ✗
Buy Dedicated Hosts for sandbox workloads to get a lower blended rate.
Why it's wrong here
Dedicated Hosts bill per physical host regardless of instance usage, so three lightly used sandbox accounts would pay for idle capacity rather than reduce spend. They suit licensing models tied to sockets or cores, such as bring-your-own Windows Server or SQL Server licences, where host-level compliance visibility matters.
When this WOULD be correct
A question requiring dedicated tenancy for licensing or compliance reasons (e.g., Microsoft SQL Server with per-core licensing) where Dedicated Hosts are necessary to meet license terms, and cost is less of a concern.
- ✗
Disable AWS Budgets because consolidated billing already solves visibility.
Why it's wrong here
AWS Budgets provides per-account and per-service spend alerts, which consolidated billing alone does not deliver; the CTO explicitly wants spend visibility, so disabling it removes the alerting mechanism. It is tempting because consolidated billing does centralise invoices and volume discounts, making budgets appear redundant — but budgets would be the right choice when granular, proactive threshold notifications are required.
When this WOULD be correct
If the question stated that the CTO wants to reduce operational overhead and budgets are causing excessive alert noise with no value, and the company already has a separate cost monitoring tool that provides visibility, then disabling AWS Budgets could be correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable consolidated billing under AWS Organizations so discounts and shared purchasing apply across accounts.Correct answer▾
Why this is correct
Consolidated billing under AWS Organizations pools usage across all four accounts, so volume discounts and Savings Plans apply to aggregate spend rather than per-account totals. This directly satisfies the CTO's lower-cost and central-purchasing requirements, while the management account retains unified spend visibility without extra tooling.
✗Move each sandbox to its own payer account to isolate spend from the rest.Wrong answer — click to see why▾
Why this is wrong here
Moving each sandbox to its own payer account increases operational overhead and reduces cost visibility, contradicting the goal of lowering cost and overhead while maintaining central purchasing and spend visibility.
★ When this WOULD be the correct answer
If the CTO required strict cost isolation between accounts (e.g., for regulatory compliance or chargeback to different departments) and did not need central purchasing or consolidated discounts, then separate payer accounts would be appropriate.
Why candidates choose this
Candidates may think separate payer accounts provide clearer cost isolation, but they overlook the increased management overhead and loss of volume discounts from consolidated billing.
✗Buy Dedicated Hosts for sandbox workloads to get a lower blended rate.Wrong answer — click to see why▾
Why this is wrong here
Dedicated Hosts increase cost and operational overhead, contradicting the goal of lowering cost and overhead. They are not needed for sandbox workloads and do not provide a lower blended rate compared to Reserved Instances or Savings Plans under consolidated billing.
★ When this WOULD be the correct answer
A question requiring dedicated tenancy for licensing or compliance reasons (e.g., Microsoft SQL Server with per-core licensing) where Dedicated Hosts are necessary to meet license terms, and cost is less of a concern.
Why candidates choose this
Candidates may think Dedicated Hosts offer cost savings through licensing benefits or assume 'dedicated' implies better pricing, not realizing they are more expensive and only beneficial for specific licensing scenarios.
✗Disable AWS Budgets because consolidated billing already solves visibility.Wrong answer — click to see why▾
Why this is wrong here
Disabling AWS Budgets removes spend visibility, which the CTO explicitly wants to maintain. Consolidated billing does not automatically provide visibility; budgets and alerts are still needed.
★ When this WOULD be the correct answer
If the question stated that the CTO wants to reduce operational overhead and budgets are causing excessive alert noise with no value, and the company already has a separate cost monitoring tool that provides visibility, then disabling AWS Budgets could be correct.
Why candidates choose this
Candidates may incorrectly assume consolidated billing alone provides full visibility and that budgets are redundant, overlooking that budgets are a separate tool for proactive cost monitoring and alerts.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAA-C03 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 SAA-C03 exam.