Write a class definition for an abstract class, Vehicle, that contains: a double instance variable, maxSpeed a protected double instance variable, currentSpeed a constructor accepting a double used to initialize the maxSpeed instance variable an abstract method, accelerate, that accepts no parameters and returns nothing. a method getCurrentSpeed that returns the value of currentSpeed a method getMaxSpeed that returns the value of maxSpeed a method, pedalToTheMetal, that repeatedly calls accelerate until the speed of the vehicle is equal to maxSpeed. pedalToTheMetal returns nothing.

1)consider the following code snippet: #ifndef book_h#define book_hconst double max_cost = 1000.0; class book{public: book(); book(double new_cost); void set_cost(double new_cost); double get_cost() const; private: double cost; }; double calculate_terms(book bk); #endifwhich of the following is correct? a)the header file is correct as given. b)the definition of max_cost should be removed since header files should not contain constants. c)the definition of book should be removed since header files should not contain class definitions. d)the body of the calculate_terms function should be added to the header file.