The correct answer is D. Process Control.
A real-time operating system (RTOS) is an operating system (OS) that guarantees to process events or data within a specified time interval. It is designed for applications that have a tight deadline for processing data, such as process control, telecommunications, and air traffic control.
Lynx is a text-based web browser. MS DOS is a discontinued operating system for personal computers. Windows XP is a discontinued operating system for personal computers.
Process Control is a type of real-time operating system that is used to control industrial processes. It is designed to ensure that the process is carried out in a safe and efficient manner.