class provides measurement of a box that is defined by its length, width, and t. Store the base of the box as a rectangle object using object composition height width length class box public: box (double 1, double w, double h): , height (h) double volume ) // length width height double getLength) ( return private: rectangle base; double height: (a) Complete the initialization list for the constructor so that the rectangle object base gets initialized. (b) Give the return value for getLengthO () Implement the member function volume hourly rate and pay them at the end of the day