gradebook = {"David": 17, "Sasha": 21, "Jing": 16, "Lucy": 19, "Marguerite": 20, "Maria": 22}The line above creates a dictionary called gradebook with six keys (all strings) and six values (all strings).Imagine if we then ran the following code:2| for student in gradebook:3| student_grade = gradebook[student]4| if student_grade > 20:5| print(student, "is doing very well!")Which of the following lines could replace lines 2 and 3 without changing the functionality of the program?for (student, student_grade) in gradebook.items():for (student, student_grade) in gradebook:for student_grade in gradebook.keys():for student_grade in gradebook.values():None of the above