4. You are working with analog signals on an Arduino, and you need to use 4.2V to indicate the maximum voltage of an analog signal. (This question has two parts. You can separate you answers with a comma.) First part: Which physical pin on the Arduino should you connect a 4.2 voltage to? Second Part: What function do you need to call in your sketch to set the reference analog voltage to 4.2? (You only need to give the function's name.) Enter answer here