Cloud Computing:Cloud computing is an emerging trend in the field of information technology, where computer-based services are delivered over the Internet or the cloud, and it is accessible to the user from anywhere using any device. The services comprise software, hardware (servers), databases, storage, etc. These resources are provided by companies called cloud service providers and usually charge on a pay per use basis, like the way we pay for electricity usage. Cloud computing is an infrastructure and software model that enables ubiquitous access to shared pools of storage, networks, servers, and applications. It allows for data processing to be done on a privately-owned cloud or a third-party server. This creates maximum speed and reliability. But the greatest benefit is its ease of installation, low maintenance, and scalability. This way it grows with your needs. We already use cloud services while storing our pictures and files as backups on the Internet or host a website on the Internet. Through cloud computing, a user can run a bigger application or process a large amount of data without having the required storage or processing power on their personal computer as long as they are connected to the Internet. Besides other numerous features, cloud computing offers cost-effective, on-demand resources. A user can avail of need-based resources from the cloud at a very reasonable cost. Examples Of Cloud Storage: Dropbox, Gmail, FacebookExamples Of Marketing Cloud Platforms: Maropost For Marketing, Hubspot, Adobe Marketing CloudExamples Of Cloud Computing In Education: SlideRocket, Ratatype, Amazon Web ServicesExamples Of Cloud Computing In Healthcare: ClearDATA, Dell's Secure Healthcare Cloud, IBM Cloud Thus, option 4 is the correct answer.