AIF-C01 Practice Question: Refer to the exhibit

Exhibit

Refer to the exhibit.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "rekognition.amazonaws.com"
      },
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::my-images/*",
      "Condition": {
        "StringEquals": {
          "aws:SourceAccount": "123456789012"
        }
      }
    }
  ]
}

Refer to the exhibit. A company has the S3 bucket policy shown above. The company uses Amazon Rekognition to analyze images in the 'my-images' bucket. An IAM role used by a Lambda function calls Rekognition. Why might Rekognition be unable to read images from the bucket?

⚠ Common exam trap

The AIF-C01 exam often tests the nuance that a bucket policy can explicitly grant access to a service principal (like Rekognition) but still block requests due to a condition key mismatch, leading candidates to incorrectly assume the policy is missing the permission entirely.

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

✓

The condition 'aws:SourceAccount' does not match the account of the Rekognition service

The bucket policy includes a condition 'aws:SourceAccount' that restricts access to requests originating from a specific AWS account. If the Rekognition service is being called from a different account (e.g., the Lambda function's IAM role is in a different account than the one specified in the condition), Rekognition will be denied read access to the S3 bucket. This condition is often misconfigured, causing cross-account access failures even when the principal is allowed.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
The Lambda function does not have an IAM role that allows Rekognition to call S3
Why it's wrong here
Rekognition does not assume the Lambda role; it uses the bucket policy.
✗
The bucket policy does not grant Rekognition access to the bucket
Why it's wrong here
The policy grants s3:GetObject to Rekognition service principal.
✗
The bucket policy does not include PutObject permission
Why it's wrong here
Rekognition only needs GetObject to read images.
✓
The condition 'aws:SourceAccount' does not match the account of the Rekognition service
Why this is correct
The condition ensures that the request originates from the specified account; if not, access is denied.

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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Last reviewed: Jun 25, 2026

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