This DVA-C02 practice question tests your understanding of development with aws services. 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 Step Functions workflow calls three independent Lambda functions and should continue only after all results are available. Which state pattern should be used?
Choice state
Why wrong: This does not meet the stated requirement as directly as the correct option.
Wait state
Why wrong: This does not meet the stated requirement as directly as the correct option.
Parallel state
Correct for the stated requirement.
Fail state
Why wrong: This does not meet the stated requirement as directly as the correct option.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Parallel state
The Parallel state in AWS Step Functions is designed to execute multiple branches of work concurrently and then aggregate their outputs into a single array. This is exactly what is needed when three independent Lambda functions must all complete before the workflow continues, as the Parallel state waits for all branches to finish before proceeding to the next state.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Choice state
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Wait state
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Parallel state
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Fail state
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Common exam traps
The trap here is that candidates may confuse the Parallel state with the Map state, but the Map state is for processing items in an array with the same logic, not for running distinct independent tasks.
Detailed technical explanation
Under the hood, the Parallel state creates a separate execution context for each branch, and the Step Functions service manages the concurrency and synchronization. The output of the Parallel state is an array containing the results from each branch in the order they are defined, which can then be passed to the next state using the `ResultPath` field. A real-world scenario is processing multiple independent data sources (e.g., fetching user profiles, inventory, and pricing) in parallel to assemble a composite response for an e-commerce application.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
The correct answer is: Parallel state — The Parallel state in AWS Step Functions is designed to execute multiple branches of work concurrently and then aggregate their outputs into a single array. This is exactly what is needed when three independent Lambda functions must all complete before the workflow continues, as the Parallel state waits for all branches to finish before proceeding to the next state.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This DVA-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 DVA-C02 exam.
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