Create a superclass called Vehicle for your MyCar class and MyTruck class. Create a constant in your subclasses that stores information about the subclass. Let the constant that is common to the MyCar class and MyTruck class is NUMER$\_$OF$\_$DOORS. $$ Your superclass should be able to keep track of the number of objects created that inherit from the superclass. Create a method to print out the value of this class variable as well. a$.$ Let that variable be number$\_$of$\_$vehicles b$.$ You need to define instance variables; year, model, color, and current$\_$speed c$.$ Current$\_$speed should be set to zero at the time of creation of the object. d$.$ Other variables can be initialized at the time of creation of the object e$.$ You need to define a function speed$\_$up$($number$)$ that will increase the speed of the vehicle by the amount $$number$$