C. Backend

Explanation:
The answer is “C. Backend” because the backend refers to the infrastructure that provides the services in cloud computing, including servers, storage systems, and databases. It is responsible for processing and storing data, while the frontend is the user interface.

Run-down of reasoning:

• The backend is the set of hardware and software infrastructure that powers cloud computing services. It includes servers, databases, and storage systems, which manage and store data. The frontend, on the other hand, interacts directly with users.