- A
Configure the S3 event notification to invoke the Lambda function for all object create events, and add logic in the Lambda function to exit early if the object is not an image.
Why wrong: This approach still invokes the function for every upload, including PDFs, which incurs cost. The goal is to avoid unnecessary invocations entirely.
- B
Add a suffix filter to the S3 event notification that includes .jpg and .png.
S3 event notifications support filters based on object key patterns. Using a suffix filter restricts the notification to only objects ending with .jpg or .png, preventing Lambda invocations for other file types.
- C
Set the S3 bucket policy to deny PutObject requests that do not have a .jpg or .png suffix.
Why wrong: Denying uploads of non-image files may not be desired. The requirement is to only invoke Lambda for images, not to block uploads of other file types.
- D
Create two separate S3 buckets: one for images and one for other files, and configure the event notification only on the image bucket.
Why wrong: While this could work, it adds operational overhead. The simpler and more cost-effective solution is to use suffix filtering on the existing bucket.
DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 developer configures an AWS Lambda function to process image files uploaded to an S3 bucket. The bucket receives a mix of .jpg, .png, and .pdf files. To reduce costs, the developer wants the Lambda function to be invoked only for image files (.jpg and .png). How should the developer configure the S3 event notification?
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
Add a suffix filter to the S3 event notification that includes .jpg and .png.
Option B is correct because S3 event notifications support suffix filters that allow you to specify which object key suffixes (e.g., .jpg and .png) trigger the event. By adding a suffix filter for .jpg and .png, only image file uploads invoke the Lambda function, directly reducing unnecessary invocations and costs without requiring any code changes in the function.
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.
- ✗
Configure the S3 event notification to invoke the Lambda function for all object create events, and add logic in the Lambda function to exit early if the object is not an image.
Why it's wrong here
This approach still invokes the function for every upload, including PDFs, which incurs cost. The goal is to avoid unnecessary invocations entirely.
- ✓
Add a suffix filter to the S3 event notification that includes .jpg and .png.
Why this is correct
S3 event notifications support filters based on object key patterns. Using a suffix filter restricts the notification to only objects ending with .jpg or .png, preventing Lambda invocations for other file types.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set the S3 bucket policy to deny PutObject requests that do not have a .jpg or .png suffix.
Why it's wrong here
Denying uploads of non-image files may not be desired. The requirement is to only invoke Lambda for images, not to block uploads of other file types.
- ✗
Create two separate S3 buckets: one for images and one for other files, and configure the event notification only on the image bucket.
Why it's wrong here
While this could work, it adds operational overhead. The simpler and more cost-effective solution is to use suffix filtering on the existing bucket.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think suffix filters can accept multiple extensions in a single filter value (e.g., '.jpg,.png'), but S3 requires separate notification configurations for each suffix, and they might incorrectly choose Option A as a simpler 'code-based' solution without realizing it fails the cost-reduction requirement.
Detailed technical explanation
How to think about this question
S3 event notification filters use prefix and suffix matching on the object key to determine which events are sent to the destination (e.g., Lambda, SQS, SNS). The suffix filter supports multiple values in a single notification configuration, but each filter must be a separate rule or use a single suffix with a wildcard pattern (e.g., .jpg and .png require two separate notification configurations or a single rule with a suffix filter that matches both, but S3 allows only one suffix per filter rule, so you must create two separate event notifications—one for .jpg and one for .png—or use a prefix filter if applicable). In practice, you configure two S3 event notifications on the same bucket, each with a different suffix filter, both pointing to the same Lambda function.
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.
What to study next
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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: Add a suffix filter to the S3 event notification that includes .jpg and .png. — Option B is correct because S3 event notifications support suffix filters that allow you to specify which object key suffixes (e.g., .jpg and .png) trigger the event. By adding a suffix filter for .jpg and .png, only image file uploads invoke the Lambda function, directly reducing unnecessary invocations and costs without requiring any code changes in the function.
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: 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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