Design a pair of spur gears for intermittent use in a chipper drive for a paper mill, transmitting 3.0 horsepower from an electric motor. Which module, pressure angle, material, and tooth profile options should be selected?
a. Module 4, Pressure angle 20 degrees, Steel, Involute
b. Module 6, Pressure angle 14.5 degrees, Cast iron, Cycloidal
c. Module 3, Pressure angle 25 degrees, Brass, Involute
d. Module 5, Pressure angle 20 degrees, Nylon, Cycloidal