Which of the Following Statements About Cloud Computing Is True

Which of the following statements about cloud computing is true?

A) Cloud computing allows you to use software and data stored in the "cloud"-i.e. ,accessed on remote computers (or servers) via the Internet and available on demand-rather than having it stored on your desktop,notebook computer or mobile device.
B) Cloud computing allows you to instantaneously scale your computing resources (e.g. ,storage and processing power) to meet their occasional peak levels,making it more cost effective than purchasing expensive hardware.
C) Microsoft's Windows Azure is a cloud computing platform that allows you to develop,manage and distribute your apps in the cloud.
D) All of the above.