A. [0.5 Points] Write a class named User. B. [2 Points] Write an initializer/constructor method in the User class with two private parameters to initialize the user's email and password. C. [3 Points] Write a method named isValid that returns true if the email contains only one @, character. Otherwise, it returns false. D. [1 Point] Write an Admin class that inheriting from the User class. E. [3.5 Points] Write an initializer/constructor method in the Admin class to initialize the numPrivileges attributes in addition to the inherited attributes, which are user's email and password. The numPrivileges attribute represents the number of privileges that are granted to this admin