Quick Answer
The answer is encrypting data at rest using AWS KMS, organizing data with partitioning, and setting up lifecycle policies. These three considerations are fundamental because a well-architected data lake on S3 must balance security, query performance, and cost efficiency—partitioning minimizes scan costs for analytics, encryption ensures compliance for sensitive ML training data, and lifecycle policies automatically tier or expire data to control storage expenses. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your understanding of S3’s native features versus other storage services; a common trap is confusing S3’s regional durability with Availability Zone concepts or selecting Provisioned IOPS, which applies only to EBS block storage. Remember the mnemonic “PEL” for Partition, Encrypt, Lifecycle—if it doesn’t fit that acronym, it’s likely a distractor for a different service.
This MLS-C01 practice question tests your understanding of data engineering. 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.
Which THREE considerations are important when designing a data lake on Amazon S3?
Setting up S3 Lifecycle policies to transition data to colder storage
Lifecycle policies manage cost.
Using Provisioned IOPS for S3
Why wrong: Provisioned IOPS is for EBS, not S3.
Partitioning data by date to improve query performance
Partitioning improves query efficiency.
Using a single Availability Zone for data storage
Why wrong: S3 is regional, not AZ-specific.
Encrypting data at rest using AWS KMS
Encryption is a security best practice.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Setting up S3 Lifecycle policies to transition data to colder storage
Organizing data with partitioning, encrypting data at rest, and setting up lifecycle policies are key. Single Availability Zone is not an S3 consideration (S3 is regional). Using Provisioned IOPS is for block storage.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Setting up S3 Lifecycle policies to transition data to colder storage
Why this is correct
Lifecycle policies manage cost.
Related concept
Read the scenario before looking for a memorised answer.
Using Provisioned IOPS for S3
Why it's wrong here
Provisioned IOPS is for EBS, not S3.
Partitioning data by date to improve query performance
Why this is correct
Partitioning improves query efficiency.
Related concept
Read the scenario before looking for a memorised answer.
Using a single Availability Zone for data storage
Why it's wrong here
S3 is regional, not AZ-specific.
Encrypting data at rest using AWS KMS
Why this is correct
Encryption is a security best practice.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
The correct answer is: Setting up S3 Lifecycle policies to transition data to colder storage — Organizing data with partitioning, encrypting data at rest, and setting up lifecycle policies are key. Single Availability Zone is not an S3 consideration (S3 is regional). Using Provisioned IOPS is for block storage.
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.
Read the scenario before looking for a memorised answer.
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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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