PROBLEM 4 [15 points] The volume of a sphere can be calculated using the formula: V GTr3, where Vis the volume of the sphere, 3.1416, and r is the radius (in cm) of the sphere. a. Determine the units of V by calculating the units resulting from the right side of the formula. Check that your answer corresponds to the SI unit of volume, namely, cubic meters b. Determine the volume of a sphere having a radius of 60 cm. c. If you were required to write a C/C++ program to determine the volume of a sphere, what inputs, outputs, and algorithm would you use