Explanation

Refactor is the correct migration strategy for this scenario because:

• Refactoring (also known as re-architecting) involves modifying the application's architecture to take advantage of cloud-native features and services
• Converting a monolithic application into microservices requires significant changes to the application's architecture and codebase
• This strategy allows the company to leverage AWS services like AWS Lambda, Amazon ECS, Amazon EKS, and API Gateway that are well-suited for microservices architectures
• The other strategies don't fit this use case:
  • Rehost (lift-and-shift): Simply moving the application as-is to the cloud without architectural changes
  • Replatform: Making minor optimizations but keeping the same basic architecture
  • Repurchase: Switching to a different product or SaaS solution

Refactoring enables the company to modernize their application by breaking it into smaller, independently deployable microservices that can scale independently and use cloud-native services effectively.