- A
Store all data in S3 Standard
Why wrong: S3 Standard is more expensive for data that is accessed infrequently.
- B
Use S3 Glacier Deep Archive
Why wrong: Glacier Deep Archive is for long-term archival, not for daily retraining.
- C
Use S3 Intelligent-Tiering
Intelligent-Tiering automatically optimizes costs for data with changing access patterns.
- D
Use S3 One Zone-IA
Why wrong: One Zone-IA is cheaper but less durable and not optimal for frequent access.
Question 1,032 of 1,755
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. 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 that was trained on a large dataset stored in Amazon S3. The model needs to be retrained daily with new data. Which approach is the MOST cost-effective for storing the training data while allowing quick access for retraining?
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
✓
Use S3 Intelligent-Tiering
S3 Intelligent-Tiering is the most cost-effective choice because it automatically moves data between access tiers (frequent, infrequent, and archive instant access) based on changing access patterns. Since the model is retrained daily, the training data will be accessed frequently during retraining but may have low access at other times, and Intelligent-Tiering optimizes storage costs without performance impact by charging a small monitoring fee per object.
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.
- ✗
Store all data in S3 Standard
Why it's wrong here
S3 Standard is more expensive for data that is accessed infrequently.
- ✗
Use S3 Glacier Deep Archive
Why it's wrong here
Glacier Deep Archive is for long-term archival, not for daily retraining.
- ✓
Use S3 Intelligent-Tiering
Why this is correct
Intelligent-Tiering automatically optimizes costs for data with changing access patterns.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use S3 One Zone-IA
Why it's wrong here
One Zone-IA is cheaper but less durable and not optimal for frequent access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose S3 Standard assuming daily access justifies it, but they overlook that Intelligent-Tiering provides the same low-latency access for frequently used data while automatically reducing costs for data that becomes less active over time.
Detailed technical explanation
How to think about this question
S3 Intelligent-Tiering monitors access patterns at the object level and moves data between four tiers: Frequent Access (standard rate), Infrequent Access (lower storage cost, higher retrieval cost), Archive Instant Access (for data accessed less than once per quarter), and Deep Archive Access (for rarely accessed data). The service charges a small monthly monitoring fee per object (currently $0.0025 per 1,000 objects), which is negligible compared to the savings from automatic tiering. In a real-world scenario, if the training data is accessed daily for retraining but only a subset is modified, Intelligent-Tiering ensures that the active subset stays in the Frequent Access tier while older, static data moves to lower-cost tiers automatically.
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.
TExam Day Tips
- 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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
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 S3 Intelligent-Tiering — S3 Intelligent-Tiering is the most cost-effective choice because it automatically moves data between access tiers (frequent, infrequent, and archive instant access) based on changing access patterns. Since the model is retrained daily, the training data will be accessed frequently during retraining but may have low access at other times, and Intelligent-Tiering optimizes storage costs without performance impact by charging a small monitoring fee per object.
What should I do if I get this MLS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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