This AZ-204 practice question tests your understanding of develop azure compute solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 Durable Functions workflow for a checkout API must call five independent activity functions and continue only after all results are available. Which pattern is appropriate?
Fan-out/fan-in
Fan-out/fan-in runs activities in parallel and aggregates results after all complete.
Human interaction
Why wrong: Human interaction waits for external manual approval or event.
Function chaining
Why wrong: Function chaining runs steps sequentially.
Monitor pattern
Why wrong: Monitor pattern periodically checks external state.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Fan-out/fan-in
The fan-out/fan-in pattern is correct because Durable Functions provides the `CallActivityAsync` method in parallel to invoke multiple independent activity functions simultaneously, and the `Task.WhenAll` pattern waits for all results before proceeding. This matches the requirement to call five independent activities and continue only after all results are available, which is the exact definition of fan-out/fan-in.
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.
Fan-out/fan-in
Why this is correct
Fan-out/fan-in runs activities in parallel and aggregates results after all complete.
Related concept
Read the scenario before looking for a memorised answer.
Human interaction
Why it's wrong here
Human interaction waits for external manual approval or event.
Function chaining
Why it's wrong here
Function chaining runs steps sequentially.
Monitor pattern
Why it's wrong here
Monitor pattern periodically checks external state.
Common exam traps
The trap here is that candidates confuse function chaining (sequential execution) with fan-out/fan-in (parallel execution), failing to recognize that the requirement for 'independent' activities and 'continue only after all results are available' explicitly demands parallelism, not sequential chaining.
Detailed technical explanation
Under the hood, the fan-out/fan-in pattern in Durable Functions uses the orchestration's replay mechanism to track parallel `CallActivityAsync` calls. The orchestrator function creates multiple tasks, awaits `Task.WhenAll`, and the Durable Task Framework ensures each activity is executed exactly once, with results stored in the orchestration history. In a real-world checkout API, this pattern allows calling payment gateway, inventory check, fraud detection, shipping calculator, and tax service in parallel, reducing total latency from the sum of all calls to the longest single call.
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
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Fan-out/fan-in — The fan-out/fan-in pattern is correct because Durable Functions provides the `CallActivityAsync` method in parallel to invoke multiple independent activity functions simultaneously, and the `Task.WhenAll` pattern waits for all results before proceeding. This matches the requirement to call five independent activities and continue only after all results are available, which is the exact definition of fan-out/fan-in.
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
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