Which statement regarding service coupling in microservice design is correct?

In the context of microservice design, loosely coupled services are essential for enabling better scalability. When services are loosely coupled, they can operate independently of one another, which allows them to be scaled up or down based on demand without affecting other services. This independence means that if a particular service experiences high loads, it can be replicated or its resources can be increased without needing to make changes to other services in the architecture.

Additionally, loosely coupled services facilitate easier maintenance, deployment, and enhancements, as developers can work on a specific service without worrying about the internal workings of other services. This modularity contributes to overall system resilience and the ability to evolve the architecture over time without significant disruption.

The other statements do not accurately reflect the principles of microservice design. Tightly coupled services, in contrast, can lead to performance bottlenecks and hinder scalability, as changes in one service may require corresponding changes in others. Thus, the emphasis on loose coupling is a fundamental aspect of designing effective microservices.