Create a class for the following description: An elevator can move up, and it can move down. Elevators can open doors, and elevators can close doors. It has five buttons: Floor 2, Floor 3, Floor 4, Open Doors, and Close Doors. These buttons are represented by an integer. Create a declaration, only, of the class to include a public constructor and functions, and private data members. Do not write out the denitions of the class functions, or you Will lose full points C++