Difference between multitasking, multithreading and multiprocessing?

Question

Whats the difference between multitasking, multiprogramming & multiprocessing

This comes regularly for my university OS exams and I can\'t find a good answer. I

Answer 1

Multiprogramming-More than on job in main memory.

Muntitasking - More than one program run simultaneously. that is more than one program in CPU.