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 is writing a Lambda function that processes images uploaded to an S3 bucket. The function needs to extract metadata from the image. Which S3 feature can be used to automatically trigger the Lambda function?
S3 Events
S3 Events can trigger Lambda function executions on object creation events.
S3 Inventory
Why wrong: S3 Inventory provides a list of objects and their metadata but does not trigger real-time events.
S3 Transfer Acceleration
Why wrong: Transfer Acceleration speeds up uploads but does not trigger functions.
S3 Batch Operations
Why wrong: Batch Operations performs bulk actions but is not event-triggered.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
S3 Events
Amazon S3 Events can be configured to send a notification when an object is created (e.g., via PutObject) in an S3 bucket. This event can directly invoke an AWS Lambda function, making it the correct service to automatically trigger the function upon image upload. The developer simply needs to set up an S3 event notification with the Lambda function as the destination.
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.
S3 Events
Why this is correct
S3 Events can trigger Lambda function executions on object creation events.
Related concept
Read the scenario before looking for a memorised answer.
S3 Inventory
Why it's wrong here
S3 Inventory provides a list of objects and their metadata but does not trigger real-time events.
S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration speeds up uploads but does not trigger functions.
S3 Batch Operations
Why it's wrong here
Batch Operations performs bulk actions but is not event-triggered.
Common exam traps
The trap here is that candidates may confuse S3 Batch Operations (which can invoke Lambda functions for batch processing) with real-time event triggers, but Batch Operations require a manual job initiation and do not automatically fire on each upload.
Detailed technical explanation
Under the hood, S3 Event Notifications use the Amazon S3 NotificationConfiguration API, which supports destinations like Lambda, SQS, and SNS. The event payload includes the bucket name, object key, size, and ETag, which the Lambda function receives as a JSON object. A subtle behavior is that S3 events are delivered at least once, so the Lambda function should be idempotent to handle duplicate invocations.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
The correct answer is: S3 Events — Amazon S3 Events can be configured to send a notification when an object is created (e.g., via PutObject) in an S3 bucket. This event can directly invoke an AWS Lambda function, making it the correct service to automatically trigger the function upon image upload. The developer simply needs to set up an S3 event notification with the Lambda function as the destination.
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
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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