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Unlike personal computers, PLCs are: Select one: a. equipped with input and output modules. b. equipped with a contro! programming language. c. designed for the industrial environment. d. all of the above. The central processing unit: Select one: a. looks at the inputs, makes the decisions based on the program, and sets the outputs. b. looks at the outputs, makes the decisions based on the program, and sets the inputs. c. serves only to store the program in memory. d. serves only to supply power to the backplane. An AND gate operates on the same principle as: Select one: a. aseries circuit. b. a parallel circuit. c. aseries-parallel circuit. d. none of these