- A
Use a scheduled Amazon EC2 Auto Scaling group that keeps a minimum of one instance running at all times.
Why wrong: Keeping a minimum instance reduces savings and still requires EC2 operational management.
- B
Use an EventBridge schedule to run the report as an Amazon ECS task on AWS Fargate and write results to S3.
Fargate allows the containerized job to run only when scheduled, so the team pays for task runtime instead of keeping an EC2 instance always on.
- C
Use AWS Lambda triggered by an EventBridge schedule at 02:00 UTC and write results to S3.
Why wrong: Lambda has a 15-minute maximum runtime, so it cannot reliably handle a workload that may take up to 45 minutes.
- D
Use an EMR cluster provisioned daily with manual teardown to ensure the instance is always available before 02:00.
Why wrong: EMR provisioning overhead and operational complexity are typically unnecessary for a daily report process.
Quick Answer
The answer is Amazon ECS on AWS Fargate triggered by an EventBridge schedule, writing results to Amazon S3. This is the correct choice because Fargate is a serverless compute engine for containers that eliminates the need to provision or manage underlying EC2 instances, automatically scaling the task’s vCPU and memory only for the duration of execution—perfect for long-running scheduled tasks that vary in runtime from 10 to 45 minutes. On the SAA-C03 exam, this scenario tests your ability to distinguish between always-on compute (wasteful) and event-driven, pay-per-use architectures; a common trap is selecting a Lambda function, but Lambda has a 15-minute execution timeout, making it unsuitable for tasks that can run up to 45 minutes. Fargate, however, has no such timeout and charges only for actual resource consumption, directly aligning with the goal of minimizing operational overhead and cost. Memory tip: “Fargate fits the fate of long tasks—Lambda lapses at fifteen.”
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 marketing team runs a report-generation process that must execute once per day at 02:00 UTC. It usually completes in 10315 minutes, but sometimes takes up to 45 minutes due to varying data volumes. They currently run the workload on an EC2 instance that is always on, which wastes money during off-hours. The team wants to minimize operational overhead and pay mainly for actual execution time.
What is the best architecture choice?
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.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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
Use an EventBridge schedule to run the report as an Amazon ECS task on AWS Fargate and write results to S3.
Amazon ECS on AWS Fargate is the best choice because it eliminates the need to manage servers, scales automatically, and charges only for the vCPU and memory resources consumed during task execution. The EventBridge schedule triggers the Fargate task at 02:00 UTC, and the report is written to S3, which provides durable, cost-effective storage. This architecture minimizes operational overhead and cost by avoiding an always-on EC2 instance.
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.
- ✗
Use a scheduled Amazon EC2 Auto Scaling group that keeps a minimum of one instance running at all times.
Why it's wrong here
Keeping a minimum instance reduces savings and still requires EC2 operational management.
- ✓
Use an EventBridge schedule to run the report as an Amazon ECS task on AWS Fargate and write results to S3.
Why this is correct
Fargate allows the containerized job to run only when scheduled, so the team pays for task runtime instead of keeping an EC2 instance always on.
Clue confirmation
The clue words "best", "always", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Lambda triggered by an EventBridge schedule at 02:00 UTC and write results to S3.
Why it's wrong here
Lambda has a 15-minute maximum runtime, so it cannot reliably handle a workload that may take up to 45 minutes.
- ✗
Use an EMR cluster provisioned daily with manual teardown to ensure the instance is always available before 02:00.
Why it's wrong here
EMR provisioning overhead and operational complexity are typically unnecessary for a daily report process.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose AWS Lambda without considering its 15-minute execution timeout, which cannot handle the 45-minute maximum runtime of this report-generation process.
Detailed technical explanation
How to think about this question
AWS Fargate runs containers without managing the underlying infrastructure, and its billing model charges per second for the vCPU and memory allocated to the task, making it ideal for batch jobs with variable durations. The EventBridge schedule uses a cron expression (e.g., 'cron(0 2 * * ? *)') to trigger the ECS task exactly at 02:00 UTC, and the task definition can specify the container image, resource limits, and environment variables. Writing results to S3 ensures the output is stored durably and can be accessed later without needing persistent compute resources.
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
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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: Use an EventBridge schedule to run the report as an Amazon ECS task on AWS Fargate and write results to S3. — Amazon ECS on AWS Fargate is the best choice because it eliminates the need to manage servers, scales automatically, and charges only for the vCPU and memory resources consumed during task execution. The EventBridge schedule triggers the Fargate task at 02:00 UTC, and the report is written to S3, which provides durable, cost-effective storage. This architecture minimizes operational overhead and cost by avoiding an always-on EC2 instance.
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", "always", "minimum / minimize". 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.
About these practice questions
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Same concept, more angles
1 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A marketing team runs a report-generation process that must execute once per day at 02:00 UTC. It usually completes in 10315 minutes, but sometimes takes up to 45 minutes due to varying data volumes. They currently run the workload on an EC2 instance that is always on, which wastes money during off-hours. The team wants to minimize operational overhead and pay mainly for actual execution time. What is the best architecture choice?
medium- A.Use a scheduled Amazon EC2 Auto Scaling group that keeps a minimum of one instance running at all times.
- ✓ B.Use an EventBridge schedule to run the report as an Amazon ECS task on AWS Fargate and write results to S3.
- C.Use AWS Lambda triggered by an EventBridge schedule at 02:00 UTC and write results to S3.
- D.Use an EMR cluster provisioned daily with manual teardown to ensure the instance is always available before 02:00.
Why B: Option B is correct because AWS Fargate allows the report-generation task to run as an Amazon ECS task triggered by an EventBridge schedule, eliminating the need for an always-on EC2 instance. Fargate charges only for the vCPU and memory resources consumed during the task's execution (typically 10–45 minutes), which aligns with the team's goal of minimizing operational overhead and paying mainly for actual execution time. Writing results to S3 provides durable, cost-effective storage without managing infrastructure.
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Last reviewed: Jun 11, 2026
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