The correct answer is to use the S3 GET Object Version API to download the specific version of each object. This works because S3 versioning preserves every overwrite as a distinct version, each with a unique version ID, allowing you to retrieve any previous state of the data. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of how to recover corrupted training data without relying on backups or replication—a common pitfall is confusing version retrieval with S3 Select or Glacier. The key insight is that versioning is an in-bucket feature, not an archival or query tool. For a memory tip, think “Version ID is your time machine”: when training data gets corrupted, you don’t rewind the bucket; you just ask for the object by its version ID.
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 media company uses SageMaker to train a recommendation model. The training data is stored in an S3 bucket with versioning enabled. The data pipeline updates the training data daily by overwriting objects with new data. Recently, the model's performance degraded, and the team suspects that the training data was corrupted on a specific day. They want to train the model using the data from a previous version. How can the team retrieve the previous version of the training data?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the S3 GET Object Version API to download the specific version of each object.
Option A is correct because S3 versioning allows retrieving any previous version of an object by specifying the version ID. The team can list versions, identify the correct version, and use it for training. Option B is incorrect because S3 Select is for querying data within an object, not for version retrieval. Option C is incorrect because S3 Glacier is for archival, not for accessing previous versions of current objects. Option D is incorrect because S3 replication does not help in retrieving previous versions from the same bucket.
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.
✗
Restore the bucket from S3 Glacier, which contains the previous version.
Why it's wrong here
S3 Glacier is for archival; versioning is managed separately.
✓
Use the S3 GET Object Version API to download the specific version of each object.
Why this is correct
S3 versioning stores multiple versions; GET Object with version ID retrieves the desired version.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use S3 Select to query the previous version of the data.
Why it's wrong here
S3 Select only queries the current version of an object.
✗
Enable S3 replication to a different bucket and use the replicated data.
Why it's wrong here
Replication copies current objects; it does not preserve previous versions unless versioning is enabled on the destination.
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 MLS-C01 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.
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the S3 GET Object Version API to download the specific version of each object. — Option A is correct because S3 versioning allows retrieving any previous version of an object by specifying the version ID. The team can list versions, identify the correct version, and use it for training. Option B is incorrect because S3 Select is for querying data within an object, not for version retrieval. Option C is incorrect because S3 Glacier is for archival, not for accessing previous versions of current objects. Option D is incorrect because S3 replication does not help in retrieving previous versions from the same bucket.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-C01 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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.