The correct answer is: B. multi-tenancy
Multi-tenancy is a software architecture that enables a single instance of an application to be used by multiple customers. Each customer’s data is isolated from the data of other customers, and each customer sees a customized version of the application.
Multi-tenancy is a common architecture for SaaS applications, as it allows providers to offer a scalable and cost-effective service.
Single-tenancy is an architecture in which each customer has their own dedicated instance of an application. This architecture is more secure and reliable than multi-tenancy, but it is also more expensive.
Multiple-instance is an architecture in which multiple instances of an application are run on separate servers. This architecture is more scalable than single-tenancy, but it is also more complex to manage.
In conclusion, the correct answer is B. multi-tenancy.