- A
Resize an image when a new image is uploaded to an S3 bucket.
Lambda can process image on upload.
- B
Generate a pre-signed URL for an object.
Why wrong: Pre-signed URLs are generated by the application, not by events.
- C
Scan an uploaded file for viruses.
Lambda can run antivirus on upload.
- D
Enable versioning on the S3 bucket.
Why wrong: Versioning is a bucket configuration, not triggered by events.
- E
Transcode a video when a new video file is created.
Lambda can initiate transcoding.
Question 215 of 1,616
Actions with Lambda and S3 Event Notifications
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.
Which THREE actions can be performed using AWS Lambda and Amazon S3 event notifications? (Choose three.)
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
✓
Resize an image when a new image is uploaded to an S3 bucket.
Option A is correct because AWS Lambda can be triggered by S3 event notifications for object creation events. When a new image is uploaded to an S3 bucket, the event notification invokes a Lambda function that can process the image, such as resizing it using libraries like Pillow or Sharp, and save the resized version back to S3.
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.
- ✓
Resize an image when a new image is uploaded to an S3 bucket.
Why this is correct
Lambda can process image on upload.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Generate a pre-signed URL for an object.
Why it's wrong here
Pre-signed URLs are generated by the application, not by events.
- ✓
Scan an uploaded file for viruses.
Why this is correct
Lambda can run antivirus on upload.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable versioning on the S3 bucket.
Why it's wrong here
Versioning is a bucket configuration, not triggered by events.
- ✓
Transcode a video when a new video file is created.
Why this is correct
Lambda can initiate transcoding.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between actions that can be automated via S3 event notifications triggering Lambda (asynchronous processing of existing objects) versus actions that require direct SDK calls or bucket-level configuration changes.
Detailed technical explanation
How to think about this question
S3 event notifications support event types like s3:ObjectCreated:* and s3:ObjectRemoved:*, and can deliver to Lambda, SQS, or SNS. The Lambda function receives an event payload containing bucket name, object key, and size, allowing it to process the object asynchronously. A real-world scenario is a media pipeline where uploaded videos trigger Lambda to transcode using Elastic Transcoder or FFmpeg, and images trigger resizing for thumbnails.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Resize an image when a new image is uploaded to an S3 bucket. — Option A is correct because AWS Lambda can be triggered by S3 event notifications for object creation events. When a new image is uploaded to an S3 bucket, the event notification invokes a Lambda function that can process the image, such as resizing it using libraries like Pillow or Sharp, and save the resized version back to S3.
What should I do if I get this DVA-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: Jul 4, 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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