S.R.T University has installed a mainframe computer for its IT department. What type of system does this represent?

The installation of a mainframe computer for the IT department at S.R.T University represents an intranet system. An intranet is a private network that uses internet protocols but is accessible only to an organization's members. It allows for secure communication and information sharing within the organization, serving as a platform for various applications and services tailored to the specific needs of that institution.

By having an intranet, S.R.T University can create a controlled environment where the data and resources on the mainframe computer are accessible to authorized users within the university. This facilitates collaboration and the sharing of information among students, faculty, and staff, enhancing their ability to communicate and work together effectively.

Other options like extranet and internet refer to broader, less restricted networks, while "cable net" does not accurately describe a type of system in this context. Thus, the choice of intranet aptly characterizes the situation of S.R.T University's mainframe installation, emphasizing its role as a private network for internal use.