- A
Use RDS MySQL with cross-Region read replicas in us-west-2. Use a hot standby EC2 environment with a single instance. Use Route 53 failover routing.
Why wrong: A single EC2 instance is a single point of failure; read replicas are for read scaling, not automatic failover.
- B
Back up RDS MySQL to S3 using automated snapshots and copy them to us-west-2. Use EC2 instances with S3-mounted volumes to serve traffic from the backup.
Why wrong: Snapshot backup RPO can be up to 24 hours; restoring from S3 is slow, RTO will exceed 30 minutes.
- C
Use RDS MySQL with Multi-AZ in us-east-1 and a second Multi-AZ deployment in us-west-2. Keep EC2 instances running in us-west-2 behind an ALB with cross-Region load balancing.
Why wrong: Multi-AZ is within a region; cross-Region load balancing is not a native feature; keeping instances running incurs cost.
- D
Set up an RDS MySQL cross-Region read replica in us-west-2. Keep a standby EC2 environment with Auto Scaling configured to scale from 0 to minimum instances using a CloudWatch alarm on health checks. Use Route 53 failover routing to switch DNS to us-west-2.
Cross-Region read replicas provide low RPO; scaling from 0 minimizes cost; Route 53 failover provides RTO.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company is designing a new multi-region disaster recovery solution for a critical application running on AWS. The primary region is us-east-1. The application uses Amazon RDS for MySQL with Multi-AZ, and runs on EC2 instances behind an ALB. The RPO must be less than 5 minutes, and RTO less than 30 minutes. The company wants to minimize costs when the DR solution is not in use. Which solution should a Solutions Architect recommend?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Set up an RDS MySQL cross-Region read replica in us-west-2. Keep a standby EC2 environment with Auto Scaling configured to scale from 0 to minimum instances using a CloudWatch alarm on health checks. Use Route 53 failover routing to switch DNS to us-west-2.
Option A is correct because RDS cross-Region replication provides RPO of seconds, and using a standby EC2 environment with Auto Scaling configured for minimum zero instances (scaling based on DNS or health checks) minimizes cost. Option B is wrong because Multi-AZ does not provide cross-Region failover. Option C is wrong because read replicas are for read scaling, not DR failover, and cannot be promoted quickly. Option D is wrong because S3 is not a database; this doesn't meet RPO/RTO.
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.
- ✗
Use RDS MySQL with cross-Region read replicas in us-west-2. Use a hot standby EC2 environment with a single instance. Use Route 53 failover routing.
Why it's wrong here
A single EC2 instance is a single point of failure; read replicas are for read scaling, not automatic failover.
- ✗
Back up RDS MySQL to S3 using automated snapshots and copy them to us-west-2. Use EC2 instances with S3-mounted volumes to serve traffic from the backup.
Why it's wrong here
Snapshot backup RPO can be up to 24 hours; restoring from S3 is slow, RTO will exceed 30 minutes.
- ✗
Use RDS MySQL with Multi-AZ in us-east-1 and a second Multi-AZ deployment in us-west-2. Keep EC2 instances running in us-west-2 behind an ALB with cross-Region load balancing.
Why it's wrong here
Multi-AZ is within a region; cross-Region load balancing is not a native feature; keeping instances running incurs cost.
- ✓
Set up an RDS MySQL cross-Region read replica in us-west-2. Keep a standby EC2 environment with Auto Scaling configured to scale from 0 to minimum instances using a CloudWatch alarm on health checks. Use Route 53 failover routing to switch DNS to us-west-2.
Why this is correct
Cross-Region read replicas provide low RPO; scaling from 0 minimizes cost; Route 53 failover provides RTO.
Clue confirmation
The clue words "primary", "minimum / minimize" in the question point toward this answer.
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 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.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 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 SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up an RDS MySQL cross-Region read replica in us-west-2. Keep a standby EC2 environment with Auto Scaling configured to scale from 0 to minimum instances using a CloudWatch alarm on health checks. Use Route 53 failover routing to switch DNS to us-west-2. — Option A is correct because RDS cross-Region replication provides RPO of seconds, and using a standby EC2 environment with Auto Scaling configured for minimum zero instances (scaling based on DNS or health checks) minimizes cost. Option B is wrong because Multi-AZ does not provide cross-Region failover. Option C is wrong because read replicas are for read scaling, not DR failover, and cannot be promoted quickly. Option D is wrong because S3 is not a database; this doesn't meet RPO/RTO.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 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.
Are there clue words in this question I should notice?
Yes — watch for: "primary", "minimum / minimize". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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