- A
Use Amazon SQS queues for each step, with Lambda functions polling each queue and forwarding to the next step.
Why wrong: This requires custom coordination logic; not as robust as Step Functions.
- B
Use Amazon SNS to publish order events, and subscribe separate Lambda functions for validation, inventory, payment, and notification.
Why wrong: SNS fan-out is good for decoupling but does not handle workflow orchestration or failure coordination.
- C
Use AWS Step Functions to define a state machine that invokes Lambda functions for each step, with retry and error handling.
Step Functions provides orchestration, error handling, and visibility into the workflow.
- D
Create a single Lambda function that performs all steps sequentially.
Why wrong: A monolithic function is tightly coupled; a failure in one step stops the entire process.
Quick Answer
AWS Step Functions is the correct choice because it provides a fully managed state machine designed to orchestrate multi-step workflow event-driven Step Functions, allowing you to coordinate independent tasks like validation, inventory checks, payment processing, and notifications with built-in retry and error handling. This decouples each step so that a failure in one does not cascade and block the entire workflow, as Step Functions can gracefully manage errors through configurable retries and fallback states. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of state machine orchestration versus simpler services like SQS or SNS, which lack native workflow logic and error recovery. A common trap is choosing a fan-out pattern with SNS and Lambda, but that misses the need for sequential coordination and failure isolation. Memory tip: think of Step Functions as the "conductor" of your serverless orchestra—each instrument (Lambda) plays independently, but the conductor ensures the right order and handles missed notes.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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 is designing a new event-driven architecture on AWS for processing orders. When a new order is placed, it must be validated, inventory checked, payment processed, and notification sent. Each step is independent and may take variable time. The company wants to decouple the steps and ensure that failures do not block the entire workflow. Which solution should a Solutions Architect recommend?
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 AWS Step Functions to define a state machine that invokes Lambda functions for each step, with retry and error handling.
AWS Step Functions is the correct choice because it provides a fully managed state machine that can orchestrate multiple Lambda functions with built-in retry logic, error handling, and parallel execution. This decouples each step (validation, inventory, payment, notification) while ensuring that failures in one step do not block the entire workflow, as Step Functions can handle errors gracefully with configurable retries and fallback states.
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 Amazon SQS queues for each step, with Lambda functions polling each queue and forwarding to the next step.
Why it's wrong here
This requires custom coordination logic; not as robust as Step Functions.
- ✗
Use Amazon SNS to publish order events, and subscribe separate Lambda functions for validation, inventory, payment, and notification.
Why it's wrong here
SNS fan-out is good for decoupling but does not handle workflow orchestration or failure coordination.
- ✓
Use AWS Step Functions to define a state machine that invokes Lambda functions for each step, with retry and error handling.
Why this is correct
Step Functions provides orchestration, error handling, and visibility into the workflow.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a single Lambda function that performs all steps sequentially.
Why it's wrong here
A monolithic function is tightly coupled; a failure in one step stops the entire process.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse decoupling with simple fan-out (SNS) or queue-based processing (SQS), overlooking the need for orchestration with error handling and sequential/parallel coordination that Step Functions uniquely provides.
Detailed technical explanation
How to think about this question
AWS Step Functions uses Amazon States Language (ASL) to define state machines that can execute tasks in sequence, parallel, or with choice states. Under the hood, it integrates with Lambda via the 'Task' state, automatically retrying on errors based on exponential backoff (e.g., intervalSeconds, maxAttempts), and can catch specific errors to route to fallback states. In a real-world scenario, if payment processing fails due to a transient error, Step Functions can retry the payment step without re-running validation or inventory checks, which is critical for maintaining order integrity.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Step Functions to define a state machine that invokes Lambda functions for each step, with retry and error handling. — AWS Step Functions is the correct choice because it provides a fully managed state machine that can orchestrate multiple Lambda functions with built-in retry logic, error handling, and parallel execution. This decouples each step (validation, inventory, payment, notification) while ensuring that failures in one step do not block the entire workflow, as Step Functions can handle errors gracefully with configurable retries and fallback states.
What should I do if I get this SAP-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 24, 2026
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