Answer: C) A model of software distribution. Instead of simply selling an application, the vendor hosts the applications and offers access for a small subscription fee.
Explanation: Software as a service(SaaS) is the cloud computing service that is used as software distribution model .It functions by delivering the applications that are hosted by the third-party over the internet towards the customers.It function on the basis of servers of Saas provider.
Other options are incorrect because users don't log into the workstation directly. This model does not provides security regarding the confidential digital data.
It does not ensure the information service available to the user as per requirement.Thus, the correct option is option(c).