The correct answer is: D. realtime system
A realtime system is an information system that responds immediately to the needs of the physical system. It is a system that must process and respond to data in a timely manner in order to control a physical process or to provide a service that depends on real-time data.
An inline system is a system that is integrated into the physical process that it controls. It is a system that is used to control the physical process in real time.
An online system is a system that is connected to a computer network. It is a system that can be accessed by users from remote locations.
An offline system is a system that is not connected to a computer network. It is a system that can only be accessed by users from the computer on which it is installed.
E. None of the above is not the correct answer because it does not describe an information system that responds immediately to the needs of the physical system.