What is a variable? What is difference between primitive and reference variables? int a = 5; Student b = new Student (); How much total bytes will be occupied by variable a and b? Create a class Student with some details about a common student. a. Create two objects of the Student class. b. Write a function that will compare these two Students objects and returns true if both objects have same information otherwise return false. c. Define briefly about the constructor type that you have used in Student class. d. Explain the difference between the way in which two primitive variables are compared and by which the two reference variables compared