SAA-C03 Q320 · Serverless

Question

A company is building a serverless web application with multiple interdependent workflows that millions of users worldwide will access. The application needs to handle bursts of traffic. Which solution will meet these requirements MOST cost-effectively?

Accepted Answer

Answer B satisfies every requirement:

1. **Serverless**: Both API Gateway HTTP API and Step Functions are fully serverless — no infrastructure to manage.

2. **Interdependent workflows**: AWS Step Functions is purpose-built for orchestrating complex, interdependent workflows with visual state machines, error handling, branching, and parallel execution.

3. **Millions of users & burst traffic**: The **usage plan with throttle settings** on API Gateway protects the backend from being overwhelmed during traffic bursts. This is critical for cost control — without throttling, uncontrolled bursts can trigger massive Step Functions executions and skyrocket costs.

4. **MOST cost-effective**: This is the decisive factor. **Express Workflows** are dramatically cheaper than Standard Workflows for h

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📘 Key Concepts

🏗️ Architecture

⚙️ Operations

💰 Cost

🔒 Security

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