bDesign a class named Rectangle to represent a rectangle. The class contains: Two double data fields named width and height that specify the width and height of the rectangle. A no$-$arg constructor that creates a rectangle with width $1$ and height $1.$ A constructor that creates a rectangle with the specified width and height. The accessor and mutator functions for all the data fields. A function named getArea$()$ that returns the area of this rectangle. A function named getPerimeter$()$ that returns the perimeter. Implement the class. Write a test program that creates two Rectangle objects. Assign width $4$ and height $40$ to the first object and width $3\mathrm{.}5$ and height $35\mathrm{.}9$ to the second. Display the width, height, area, and perimeters of the first object and then the second object.