Microservices Architecture

B.

The correct answer is B: it is a complex application composed of multiple independent parts.

Microservices architecture is a software design approach that structures applications as a collection of small, independent services, each of which is responsible for performing a specific task or function. These services communicate with each other over a network, using lightweight mechanisms such as RESTful APIs or message queues.

Option A is incorrect because microservices are not written as a single unit, but rather as a collection of small, independent services that work together.

Option C is partly correct. It can be challenging to scale individual parts of a microservices application because each service must be scaled independently. However, this is seen as an advantage because it allows for more efficient use of resources, and the ability to scale only the parts of the application that require it.

Option D is partly correct as well. If a single microservice fails, it may impact the functionality of the overall application. However, since each service is independent, a failure in one service will not necessarily bring down the entire application.

In summary, microservices architecture is a complex application composed of multiple independent parts. This approach allows for greater flexibility, scalability, and resilience compared to monolithic applications, where all functionality is contained within a single codebase.