Is a computing model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computer resources that be rapidly provisioned and released with minimal management effort or service provider interaction.
a. cloud computing
b. obdc
c. database middleware
d. sql data services

A. Cloud computing

Explanation:

Cloud computing is an on-demand use of computing infrastructure and resources. The pay as you use model means users pay for the resources and workloads they will have used at a given time, which significantly cuts costs of using the service. The service is easily accessible as it can be accessed anywhere using a PC and an internet connection. Cloud services are highly scalable which means users are able to adjust according to their computing needs. The service is fully managed and maintained by the service provider which reduces management effort from the user.