The answer is "a. True".
Preemptive multitasking refers to a task in which a PC operating system utilizes a few criteria to choose to what extent to allot to any one errand before giving another assignment a swing to utilize the working framework. The demonstration of taking control of the working framework starting with one errand and giving it then onto the next assignment is called preempting.
A typical basis for preempting is basically slipped by time (this sort of framework is now and again called time sharing or time cutting). In some operating systems, a few applications can be given higher need than different applications, giving the higher need programs control when they are started and maybe longer time slices.