CV0-004 Deployment Practice Question
A cloud engineer is deploying a serverless application that processes images uploaded to an object storage bucket. The application must automatically resize each image and store the resized version in a second bucket. The engineer wants to minimize operational overhead and ensure the processing runs only when new images are added. Which AWS service should the engineer use to trigger the processing?
⚠ Common exam trap
The trap here is assuming that any compute service can be triggered by S3 events, when actually only AWS Lambda provides native, direct event integration with S3 without additional infrastructure.
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
✓
AWS Lambda with an S3 event trigger
AWS Lambda with an S3 event trigger is the correct choice because it directly responds to object creation events in Amazon S3 without requiring any server management. The integration is native, so the function runs only when new images are uploaded, aligning with the need for minimal operational overhead and automatic processing. Other options involve more management or are not event-driven.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon EC2 Auto Scaling group with a custom application
Why it's wrong here
Using EC2 instances with an Auto Scaling group requires provisioning and managing servers, patching the OS, and writing code to poll for new objects. This increases operational overhead and does not provide native event integration, making it unsuitable for a low-maintenance, event-driven image processing solution.
- ✗
AWS Batch with a job queue
Why it's wrong here
AWS Batch is designed for batch computing workloads that run on managed compute environments, not for real-time event-driven processing of individual object uploads. It requires configuring job definitions and queues, adding operational overhead and latency, which does not meet the need for immediate, automatic image resizing.
- ✓
AWS Lambda with an S3 event trigger
Why this is correct
AWS Lambda natively integrates with Amazon S3 events, allowing the function to execute automatically when an object is created. This serverless approach eliminates server management and scales with the number of uploads, matching the requirement for minimal operational overhead and event-driven processing.
- ✗
AWS Step Functions with a polling loop
Why it's wrong here
Step Functions can orchestrate workflows, but using a polling loop to check for new S3 objects introduces delay and unnecessary complexity. It does not provide native event triggers and would require additional components to detect uploads, failing to meet the requirement for automatic and immediate processing.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.