7. The most common operating system for PC is а) DOS б) Microsoft Windows в) Mac OS г) Linux д) Unix 8. During world war 2 mauchly and Eckert constructed the а) ABC б) ENIAC в) UNIVACI г) MARK 1 д) MARK 2 9.Which is a correct association between hardware, device and component type? а) Mouse processing б) Keyboard input в) Hard disk output г) CPU storage д) No correct answer