40. When was vacuum tube invented? A) 1900 B) 1906 C) 1910 D) 1880 41. Which of the following produces the best quality graphics reproduction? A) Laser printer B) Ink jet printer C) Plotter D) Dot matrix printer 42. Computers with 80286 microprocessor is A) XT computer B) AT comptuers C) PS/2 computer D) None of above 43. An application suitable for sequential processing is A) Processing of grades B) Payroll processing C) Both a and b D) All of above