The correct answer is to use an Azure Function triggered by Blob Storage on a Consumption plan. This serverless, event-driven architecture ensures that each image upload immediately triggers a function to resize and analyze the image for offensive content, with the Consumption plan charging only for actual execution time and resources—making it both low-latency and cost-effective for sporadic workloads. On the AZ-204 exam, this scenario tests your understanding of event-driven processing and serverless compute choices, often contrasting the Consumption plan against Premium or App Service plans to trap candidates who overlook cost optimization. A common memory tip is to associate “blob trigger” with “instant reaction” and “Consumption” with “pay-per-use,” so when you see image processing with minimal cost, think serverless functions tied directly to storage events.
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute 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.
You are developing a web application that processes images uploaded by users. The images must be resized and analyzed for offensive content before being stored. You need to implement the solution with minimal latency and cost. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an Azure Function triggered by Blob Storage, with Consumption plan.
Option D is correct because using an Azure Function triggered by Blob Storage on a Consumption plan provides a serverless, event-driven architecture that automatically scales to process each image upload with minimal latency and cost. The Consumption plan charges only for execution time and resources used, making it cost-effective for sporadic workloads, while the Blob Storage trigger ensures immediate processing upon upload without polling or additional infrastructure.
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 Azure Batch to process images in parallel.
Why it's wrong here
Azure Batch is designed for large-scale batch jobs, not real-time processing.
✗
Use Durable Functions to orchestrate the resizing and analysis.
Why it's wrong here
Durable Functions add overhead for state management, not needed here.
✗
Use Azure Logic Apps with a trigger for each upload.
Why it's wrong here
Logic Apps add latency and cost compared to Functions.
✓
Use an Azure Function triggered by Blob Storage, with Consumption plan.
Why this is correct
Functions with Consumption plan are event-driven, cost-effective, and scale automatically.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often over-engineer the solution by choosing orchestration tools like Durable Functions or Logic Apps for simple sequential tasks, missing that a single Azure Function triggered by Blob Storage is the simplest, lowest-latency, and most cost-effective approach for event-driven image processing.
Detailed technical explanation
How to think about this question
Under the hood, the Blob Storage trigger uses an Azure Storage queue internally to reliably capture blob creation events, ensuring at-least-once delivery even under high throughput. The Consumption plan's dynamic scaling is based on the number of pending messages in that queue, allowing the function to handle thousands of concurrent uploads with sub-second cold start times when using the Premium plan, though the Consumption plan may have cold start latency of up to a few seconds. In a real-world scenario, combining the Blob Storage trigger with Azure Functions' built-in output bindings to write resized images to another container and calling the Azure Content Moderator API for analysis keeps the pipeline simple and cost-efficient.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use an Azure Function triggered by Blob Storage, with Consumption plan. — Option D is correct because using an Azure Function triggered by Blob Storage on a Consumption plan provides a serverless, event-driven architecture that automatically scales to process each image upload with minimal latency and cost. The Consumption plan charges only for execution time and resources used, making it cost-effective for sporadic workloads, while the Blob Storage trigger ensures immediate processing upon upload without polling or additional infrastructure.
What should I do if I get this AZ-204 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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Question Discussion
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