Utility software are programs designed to perform maintenance work on a computer system, so that the system can function smoothly. Which among the following is/are utility software?
(i) Word processing software
(ii) Disk defragmenter
(iii) Antivirus software
(iv) Desktop publishing software
A Both (i) and (ii)
B Both (ii) and (iii)
C Both (iii) and (iv)
D Both (i) and (iii)