- A
Implement preprocessing as an AWS Lambda function invoked before inference.
Why wrong: Lambda may have different library versions or scaling issues, leading to inconsistencies.
- B
Deploy a separate preprocessing endpoint and call it before the model endpoint.
Why wrong: This adds latency and network overhead, and still may have consistency issues.
- C
Retrain the model in each inference request with the preprocessing applied.
Why wrong: Retraining per request is computationally infeasible and not how inference works.
- D
Create a Scikit-learn pipeline that includes preprocessing and the model, then deploy it.
The pipeline ensures consistent transformation during training and inference.
- E
Use SageMaker Inference Pipeline to chain a preprocessing container with the model container.
Inference Pipelines ensure the same preprocessing steps are executed in a serial fashion.
Quick Answer
The correct answer is to use a SageMaker Inference Pipeline to chain a preprocessing container with the model container, or to bundle preprocessing steps into a single scikit-learn pipeline object. These two options ensure the same preprocessing in training and inference SageMaker by encapsulating the transformation logic—whether as a serialized pipeline object or as a separate container in a sequential endpoint—so the exact same scaling, encoding, or feature engineering steps are applied consistently without manual reimplementation. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your understanding of deployment architecture and the common pitfall of preprocessing drift, where separate code paths for training and inference introduce subtle errors. A frequent trap is assuming a Lambda function or a separate endpoint can guarantee parity, but these increase complexity and risk inconsistency. Remember the mnemonic: “Pipeline or Pipeline”—either a code-level pipeline (scikit-learn) or a service-level pipeline (SageMaker Inference Pipeline) locks in preprocessing fidelity.
MLS-C01 Modeling Practice Question
This MLS-C01 practice question tests your understanding of modeling. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 machine learning engineer is deploying a model using Amazon SageMaker. The model requires preprocessing steps (e.g., scaling, encoding) that were applied during training. Which TWO options can ensure the same preprocessing is applied at inference?
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
Create a Scikit-learn pipeline that includes preprocessing and the model, then deploy it.
Options A and D are correct. Scikit-learn pipelines bundle preprocessing and model into a single object. SageMaker Inference Pipelines chain preprocessing and prediction containers. Option B is wrong because Lambda function may introduce inconsistencies. Option C is wrong because separate endpoint adds complexity. Option E is wrong because re-training the model in each inference request is impractical.
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.
- ✗
Implement preprocessing as an AWS Lambda function invoked before inference.
Why it's wrong here
Lambda may have different library versions or scaling issues, leading to inconsistencies.
- ✗
Deploy a separate preprocessing endpoint and call it before the model endpoint.
Why it's wrong here
This adds latency and network overhead, and still may have consistency issues.
- ✗
Retrain the model in each inference request with the preprocessing applied.
Why it's wrong here
Retraining per request is computationally infeasible and not how inference works.
- ✓
Create a Scikit-learn pipeline that includes preprocessing and the model, then deploy it.
Why this is correct
The pipeline ensures consistent transformation during training and inference.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use SageMaker Inference Pipeline to chain a preprocessing container with the model container.
Why this is correct
Inference Pipelines ensure the same preprocessing steps are executed in a serial fashion.
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 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.
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Modeling — This question tests Modeling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Scikit-learn pipeline that includes preprocessing and the model, then deploy it. — Options A and D are correct. Scikit-learn pipelines bundle preprocessing and model into a single object. SageMaker Inference Pipelines chain preprocessing and prediction containers. Option B is wrong because Lambda function may introduce inconsistencies. Option C is wrong because separate endpoint adds complexity. Option E is wrong because re-training the model in each inference request is impractical.
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
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Last reviewed: Jun 20, 2026
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.
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