Which of the following differentiates grid computing from cloud computing?

A$.$ Grid computing is a model for enabling convenient, on$-$demand network access to a shared pool of configurable computing resources.

B$.$ Grid computing is a natural evolution of the widespread adoption of virtualization and utility computing

C$.$ Grid computing uses a large number of computers.

D$.$ Grid computing involves over$-$the$-$Internet provision of dynamically scalable and often virtualized resources.

E$.$ Grid computing is applied to a single large problem.