Search online and find a Python program sample program written in Python that defines a base class A, which has a subclass B, which itself has a subclass C. The A class must implement at least three methods, one of them is overridden in both B and C. Briefly explain the purpose of the program. A. Adobe Acrobat Reader DC elp t Assig.. x Instructions 1 Using IDLE create a new empty script file in your working drive. Name the script/program; PROLastFirst (NOTE: where LastFirst is your actual Lastname and Firstname. For example, if your name is Mary then your empty project folder will be named PROSmithMary) 2. You will develop a WEIGHTED AVERAGE/GRADE CALCULATOR program as described below: In this project, you will develop a GUI based weighted average/grade calculator program (using Object Oriented concepts). The program should receive your raw scores(%) for the various categories of assignments and exams through a GUL. You will then calculate weighted average (Refer to the Category Weights Table 20. below) and the corresponding Letter Grade (Refer to the Grading Scale Table 2b. below) Your program should then display result of weighted average and letter grade similar to the example output screenshot in Step 3. below Category Discussions Revel Labs Quizzes Programs/Project Exami Exam2 Final Exam Weight (% of total) 5% 10% 10% 15% 15% 15% 30% Average >89.45%