easyMultiple SelectObjective-mapped
AIF-C01 Practice Question: Using Amazon Rekognition to detect objects in…
A company is using Amazon Rekognition to detect objects in images stored in an S3 bucket. The company needs to ensure that the Rekognition service has permission to read images from the S3 bucket. Which TWO methods can achieve this? (Choose TWO.)
⚠ Common exam trap
Test-takers frequently confuse which AWS services can assume IAM roles (like Lambda or EC2) versus those that require resource-based policies (like Rekognition or S3), leading them to incorrectly select option B.
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
✓
Attach an IAM role to the Lambda function that calls Rekognition, with an IAM policy granting s3:GetObject on the bucket
When a Lambda function calls Amazon Rekognition, the function needs an IAM role with a policy that grants s3:GetObject permission on the source bucket. This allows the Lambda function to read the images and pass them to Rekognition for analysis. Option E is correct because you can attach a bucket policy that explicitly grants the Rekognition service principal (rekognition.amazonaws.com) permission to read objects, enabling Rekognition to directly access the S3 bucket when invoked.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Attach an IAM role to the Lambda function that calls Rekognition, with an IAM policy granting s3:GetObject on the bucket
Why this is correct
The IAM role provides permissions to the Lambda function to read from S3.
- ✗
Create an IAM role for Rekognition to assume and attach it to the Rekognition service
Why it's wrong here
Rekognition cannot assume a role; the calling service must assume the role.
- ✗
Configure the S3 bucket with a bucket ACL that grants read access to the Rekognition service
Why it's wrong here
Bucket ACLs are not the recommended way; Rekognition uses IAM or bucket policies.
- ✗
Attach a resource-based policy to the Rekognition collection allowing S3 access
Why it's wrong here
Rekognition collections do not have resource-based policies.
- ✓
Add a bucket policy that grants the Rekognition service principal (rekognition.amazonaws.com) permission to read objects
Why this is correct
A bucket policy can grant cross-service access to Rekognition.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AIF-C01 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 AIF-C01 exam.