Derive equivalence classes for the input variables listed below. a. int pen_inventory; Current inventory level of writing pens. b. string planet_name; Planet name. c. operating_system={“OS X”,...

Derive equivalence classes for the input variables listed below. a. int pen_inventory; Current inventory level of writing pens. b. string planet_name; Planet name. c. operating_system={“OS X”, “Windows XP”, “Windows 2000”, “Unix”, “Linux”, “Xinu”, “VxWorks”}; Name of an operating system. d. printer_class=set printer_name; printer_class p; Set of printer names. e. int name [1.10]; An array of at most 10 integers.