MLS-C01 Data Engineering Practice Question

Exhibit

Refer to the exhibit.
{
  "Records": [
    {
      "eventVersion": "2.1",
      "eventSource": "aws:s3",
      "awsRegion": "us-east-1",
      "eventName": "ObjectCreated:Put",
      "s3": {
        "s3SchemaVersion": "1.0",
        "bucket": {
          "name": "my-bucket",
          "arn": "arn:aws:s3:::my-bucket"
        },
        "object": {
          "key": "data/file.csv",
          "size": 1024
        }
      }
    }
  ]
}

An S3 event notification is configured to trigger a Lambda function when new objects are created. The Lambda function processes the event JSON shown. Which field should the function use to read the new object from S3?

⚠ Common exam trap

Many candidates confuse metadata fields like `eventName` or `awsRegion` with the actual object location, overlooking that only the bucket ARN and object key together provide the necessary S3 coordinates for retrieval.

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

✓

s3.bucket.arn and s3.object.key

The Lambda function needs the bucket name and object key to retrieve the new object from S3. The `s3.bucket.arn` provides the bucket identifier, and `s3.object.key` provides the object path. Together, they allow the function to call `GetObject` on the S3 API.

Answer analysis

Option-by-option breakdown

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

✗
s3.s3SchemaVersion
Why it's wrong here
This is the schema version, not the object identifier.
✗
awsRegion
Why it's wrong here
Region alone is not enough to identify the object.
✗
eventName
Why it's wrong here
Event name indicates the operation, not the object.
✓
s3.bucket.arn and s3.object.key
Why this is correct
These provide the bucket ARN and object key.

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

Go deeper

Timed practice sets

Short scored sets — answer, get feedback, read the explanation, move on.

MLS-C01 Practice Questions 1 — 50 Questions→Free MLS-C01 Practice Test 3 — 30 Questions→

Study by exam domain

Drill one exam section at a time instead of jumping between unrelated topics.

Data Engineering Exploratory Data Analysis Modeling

Filter by question format

Filter questions by type — troubleshooting, exhibit, drag-and-drop, multi-select, and more.

Browse scenarios

Practice by topic

One concept per page — questions, worked explanations, and a short concept guide.

Data Engineering practice questions MLS-C01 troubleshooting practice questions Exploratory Data Analysis practice questions MLS-C01 scenario practice questions

Where to go next

All Amazon Web Services practice questions AWS Certified Machine Learning Specialty MLS-C01 exam guide Exam domains

This MLS-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 MLS-C01 exam.

MLS-C01 Data Engineering Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

Related to this question