The correct answer is D. all of the mentioned.
Cloud computing is the on-demand delivery of IT resources over the Internet with pay-as-you-go pricing. Instead of buying, owning, and maintaining physical data centers and servers, you can access technology services, such as computing power, storage, and databases, on an as-needed basis from a cloud provider like Amazon Web Services (AWS).
Web applications are applications that are accessed over the Internet using a web browser. They are typically hosted on a web server and can be accessed by anyone with an Internet connection.
An intranet is a private network that is used by an organization to share information and resources with its employees. It is typically hosted on a company’s own servers and is not accessible to the public.
Hadoop is an open-source software framework for storing and processing large amounts of data. It is designed to be scalable and fault-tolerant, and it is often used for big data applications.
All of these technologies can be classified as cloud computing.