17- Draw the ladder rungs to represent: a) Two switches are normally open and both have to be closed for a motor to operate. b) Either of two, normally open, switches has to be closed for a coil to be energized and operate an actuator. c) A motor is switched on by pressing a spring-return push button start switch, and the motor remains on until another spring-return push button stop switch is pressed. d) A lamp is to be switched on if there is an input from sensor A or sensor B. e) A light is to come on if there is no input to a sensor. 1) A solenoid valve is to be activated if sensor A gives an input.