Answer:
The question is invalid; there are many types of computer user. Why on earth do you think there are five?
From the top of my head.
Casual- someone at home browsing the web, reading email.
IT Consultant. Advising people.
Software developer- writing software
Secretary - manages email for a company
Academic. Writing research papers.
Monitors. Monitor a computer system.
That’s six off the top of my head. There are probably a dozen more. So why do you think there are five?