The correct answer is D. all of the mentioned.
Cloud backup, web applications, and business applications were all among the top 5 cloud applications in 2010.
Cloud backup is the process of storing data on remote servers in the cloud. This can be done for a variety of reasons, such as to protect data from hardware failure, to provide access to data from anywhere, or to save on storage costs.
Web applications are applications that are accessed over the internet. They are typically hosted on servers in the cloud and can be accessed by any device with an internet connection.
Business applications are applications that are used by businesses to manage their operations. They can include applications for accounting, customer relationship management, and human resources.
All of these applications have become increasingly popular in recent years as the cloud has become more widely available and affordable.