When I was searching online stores for a new computer, I noticed that I had a choice of Processor, RAM and operating system (a) Define Operating System (2 marks) (b) Explain the four (4) principal functions of an operating system for a PC (8 marks) (c) List two (2) types of operating systems manufactured by different companies on the market in Zambia (2 marks) (d) If I purchased one of these computers, I would need to purchase a processor chip (CPU) and memory chips (i) Explain three (3) factors (other than cost) that I should consider when purchasing a processor chip (6 marks) (ii) Suitable RAM chips are available in 256MB, 512MB and 1GB sizes. What would happen if I installed only a small memory chip and tried to run a game program that used complex graphics​