What is cloud computing? Select correct statements in describing cloud computing.

A cloud user company often shares the computing resources with other user companies, and a cloud provider is responsible for managing the resources.

Most companies have no issues in using cloud computing and may consider storing critical and sensitive data in the cloud.

A third$-$party service provider offers computing resources including hardware and software applications to users over the Internet cloud.

Most cloud computing service providers charge on a per$-$user basis.