Question 4 (15+5 Points) The answer to this question is divided into two parts. Please write your answer below each part. Part (2) is on the next page. Part (1) Create a class called RoomCarpet that has three private instance variables - room length and width in foot (double) and carpet cost per square foot (double). Additionally, the class should have: a. A constructor that takes room length, room width and carpet cost per square foot. The constructor sets the class variables to these values and in case any of these values is negative, set its instance varioble to zero. b. A mutator method (set) and an accessor method (get) for the carpet cost variable only. c. A method get Area that returns the area of the room. The area of the room is computed by multiplying the room's length by the room's width. d. A method getTotalCost that returns the total cost of the carpet. The total cost is computed by multiplying the room area by the carpet cost per square foot. Part (2) Write a lava application that asks the user to enter the length and width of a room and the cost per square foot of the carpeting. Create an object from RoomCarpet class you defined in Part (1) and use it to display the room area and the total cost of the carpet