- A
Add a resource-based policy to the Lambda function that grants S3 permission to invoke it.
A resource-based policy (function policy) allows S3 to invoke the Lambda function.
- B
Configure an S3 bucket notification event to send events to the Lambda function.
S3 bucket notification configuration triggers Lambda on events.
- C
Attach an IAM role to the S3 bucket that allows it to invoke Lambda functions.
Why wrong: S3 does not assume an IAM role to invoke Lambda; it uses resource-based policies.
- D
Create an event source mapping in Lambda for the S3 bucket.
Why wrong: S3 events use push model; no event source mapping is needed.
- E
Create an IAM role for the Lambda function with permissions to read from the S3 bucket.
The Lambda function needs IAM permissions to access the S3 object.
Quick Answer
The correct answer involves three steps: creating a resource-based policy on the Lambda function to allow S3 invocation, configuring an S3 bucket notification to trigger the function, and attaching an IAM role to the Lambda function with permissions to read from the S3 bucket. This works because S3 invokes Lambda via a push model, where the bucket sends an event directly to the function; the resource-based policy acts as a trust policy granting S3 principal the lambda:InvokeFunction action, while the IAM role gives the function itself the necessary s3:GetObject permissions to process the event. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of cross-service permissions and the distinction between resource-based policies and IAM roles—a common trap is thinking you need to add an IAM policy to the S3 bucket for invocation, but that is incorrect because S3 does not assume a role to invoke Lambda. Remember the memory tip: "S3 pushes, Lambda trusts; the bucket notifies, the role reads."
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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 company is designing a new serverless application using AWS Lambda. The application must be invoked by an Amazon S3 bucket event. The company wants to ensure that the Lambda function has the necessary permissions to be invoked. Which THREE steps are required?
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 resource-based policy to the Lambda function that grants S3 permission to invoke it.
Options A, B, and D are correct. A resource-based policy on the Lambda function allows S3 to invoke it. An S3 bucket notification configuration triggers the Lambda. IAM permissions on the S3 bucket are not required for invocation; the resource-based policy is. Option E is wrong because the event source mapping is not needed for 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.
- ✓
Add a resource-based policy to the Lambda function that grants S3 permission to invoke it.
Why this is correct
A resource-based policy (function policy) allows S3 to invoke the Lambda function.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure an S3 bucket notification event to send events to the Lambda function.
Why this is correct
S3 bucket notification configuration triggers Lambda on events.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Attach an IAM role to the S3 bucket that allows it to invoke Lambda functions.
Why it's wrong here
S3 does not assume an IAM role to invoke Lambda; it uses resource-based policies.
- ✗
Create an event source mapping in Lambda for the S3 bucket.
Why it's wrong here
S3 events use push model; no event source mapping is needed.
- ✓
Create an IAM role for the Lambda function with permissions to read from the S3 bucket.
Why this is correct
The Lambda function needs IAM permissions to access the S3 object.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Design for New Solutions — study guide chapter
Learn the concepts, then practise the questions
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Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a resource-based policy to the Lambda function that grants S3 permission to invoke it. — Options A, B, and D are correct. A resource-based policy on the Lambda function allows S3 to invoke it. An S3 bucket notification configuration triggers the Lambda. IAM permissions on the S3 bucket are not required for invocation; the resource-based policy is. Option E is wrong because the event source mapping is not needed for S3.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 20, 2026
This SAP-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 SAP-C02 exam.
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