- A
Memory optimized instances
Why wrong: These are better when the workload is limited by RAM capacity, not CPU throughput.
- B
Compute optimized instances
These instances are designed for workloads that need strong CPU performance and efficient compute price-performance.
- C
Storage optimized instances
Why wrong: These are intended for very high sequential read or write throughput to local storage.
- D
General purpose instances
Why wrong: These are balanced, but they are not the best first choice for heavy CPU processing.
Question 337 of 1,040
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 team runs a CPU-intensive image processing service on Amazon EC2. The service spends most of its time resizing and compressing images, and the team wants the best price-performance starting point for compute-heavy work. Which EC2 instance family should they choose?
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
✓
Compute optimized instances
Compute optimized instances (C family) are designed for workloads that benefit from high-performance processors, such as batch processing, media transcoding, and image processing. Since the team's service is CPU-intensive (resizing and compressing images), the C family provides the best price-performance starting point for compute-heavy work.
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.
- ✗
Memory optimized instances
Why it's wrong here
These are better when the workload is limited by RAM capacity, not CPU throughput.
When this WOULD be correct
A question describing a service that processes large in-memory databases or real-time big data analytics, where the primary bottleneck is memory capacity and throughput, would make memory optimized instances the correct choice.
- ✓
Compute optimized instances
Why this is correct
These instances are designed for workloads that need strong CPU performance and efficient compute price-performance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Storage optimized instances
Why it's wrong here
These are intended for very high sequential read or write throughput to local storage.
When this WOULD be correct
A question asking for an EC2 instance family optimized for workloads that require high, sequential read/write access to very large datasets stored locally on the instance, such as distributed file systems, data warehousing, or log processing.
- ✗
General purpose instances
Why it's wrong here
These are balanced, but they are not the best first choice for heavy CPU processing.
When this WOULD be correct
A question asks for a balanced instance family for a web application with moderate CPU and memory usage, where cost and flexibility are priorities, and no specific resource is a bottleneck.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Compute optimized instancesCorrect answer▾
Why this is correct
These instances are designed for workloads that need strong CPU performance and efficient compute price-performance.
✗Memory optimized instancesWrong answer — click to see why▾
Why this is wrong here
Memory optimized instances are designed for workloads that process large datasets in memory, not for CPU-intensive tasks like image resizing and compression, which primarily require high compute power.
★ When this WOULD be the correct answer
A question describing a service that processes large in-memory databases or real-time big data analytics, where the primary bottleneck is memory capacity and throughput, would make memory optimized instances the correct choice.
Why candidates choose this
Candidates may mistakenly think that image processing requires large amounts of memory, or they may confuse memory-intensive workloads with compute-intensive ones.
✗Storage optimized instancesWrong answer — click to see why▾
Why this is wrong here
Storage optimized instances are designed for workloads with high sequential I/O access to large datasets on local storage, not for CPU-intensive image processing tasks like resizing and compressing images.
★ When this WOULD be the correct answer
A question asking for an EC2 instance family optimized for workloads that require high, sequential read/write access to very large datasets stored locally on the instance, such as distributed file systems, data warehousing, or log processing.
Why candidates choose this
Candidates may mistakenly think image processing involves heavy disk I/O due to reading/writing many image files, leading them to choose storage optimized instances instead of focusing on the CPU-bound nature of the task.
✗General purpose instancesWrong answer — click to see why▾
Why this is wrong here
General purpose instances balance compute, memory, and networking, but for CPU-intensive image processing, compute optimized instances offer better price-performance due to higher vCPU count and faster clock speeds.
★ When this WOULD be the correct answer
A question asks for a balanced instance family for a web application with moderate CPU and memory usage, where cost and flexibility are priorities, and no specific resource is a bottleneck.
Why candidates choose this
Candidates may assume 'general purpose' is always a safe starting point, overlooking that CPU-intensive workloads benefit from specialized compute optimized instances for better performance per cost.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'CPU-intensive' with 'memory-intensive' or 'storage-intensive' and choose a general purpose instance (D) thinking it is a safe default, but the question specifically asks for the best price-performance starting point for compute-heavy work, which is the compute optimized family.
Detailed technical explanation
How to think about this question
Compute optimized instances (e.g., C7g, C6i) use high-frequency Intel Xeon Scalable or AWS Graviton processors with features like Intel Turbo Boost or all-core turbo, which directly benefit CPU-bound tasks like image resizing and compression. For example, the C7g instance based on AWS Graviton3 offers up to 25% better performance than C6g for compute-intensive workloads, and using instance store volumes or EBS-optimized connections can further reduce latency for temporary image data.
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 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
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Compute optimized instances — Compute optimized instances (C family) are designed for workloads that benefit from high-performance processors, such as batch processing, media transcoding, and image processing. Since the team's service is CPU-intensive (resizing and compressing images), the C family provides the best price-performance starting point for compute-heavy work.
What should I do if I get this SAA-C03 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.
About these practice questions
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Last reviewed: Jun 11, 2026
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