Hint: use a variable to hold the current duty cycle $($dc$)$ value. In loop$(),$ check the up button; if pressed,add $25$ to the variable. Also check the down button; if pressed, subtract $25$ from the variable. Observewhat happens as you exceed max dc or min dc values possible and be ready to explain it to the TA$.$How would you fix it if you had more time?Part $3.$ Write a program that implements a fou