What is a process in an operating system?

A process is a program in execution, consisting of the executable program, its data and stack, counter and other registers, as well as all the information necessary to execute the program.
The operating system periodically decides to stop the execution of a process and start the execution of another.
When a process is temporarily stopped, all information related to the process must be explicitly stored somewhere during the suspension.
In many operating systems, all information related to a process, other than the contents of its own address space, is stored in a system table called the process table.
a) Only statements I and II are correct.
b) Only statements II and III are correct.
c) Only statements III and IV are correct.
d) All statements are correct.