2. Write the class Section which includes: (23 marks) a) 2 attributes: Section number and ArrayList of Students. b) one-arg constructor that accepts (as an argument) the Section number, and create a new empty ArrayList of Students. c) method addStudent() that accepts a Student and add it to the ArrayList with a confirmation message. It is not allowed to add the same Student twice and in this case an error message should be displayed. d) method averageGPAO) which returns the average GPA of regular Students (whose GPA >= 2). It returns O if there are no regular students in the section e) method savelntoFile() which accepts a file name. It stores the section number and information of all Students in this file (each Student in a different line)