When a student has not selected a major at a university, the university typically puts a value of "Undecided" for the major field. Is "Undecided" a method to express the null value? Should it be used as a default value? Justify your answer carefully.

pls help me using python This is the code it provides: class Artist:# TODO: Define constructor with parameters to initialize instance attributes# (name, birth_year, death_year) # TODO: Define print_info() method. If death_year is -1, only print birth_year class Artwork:# TODO: Define constructor with parameters to initialize instance attributes# (title, year_created, artist) # TODO: Define print_info() method if __name__ == "__main__":user_artist_name = input()user_birth_year = int(input())user_death_year = int(input())user_title = input()user_year_created = int(input()) user_artist = Artist(user_artist_name, user_birth_year, user_death_year) new_artwork = Artwork(user_title, user_year_created, user_artist)new_artwork.print_info()

Question 02: Please look closely at the following "Employee" class. The class is a good example of low cohesion and you need to mention how? Then you are required to come up with the class design that must reflect highly cohesive classes and as well as loosely coupled. You are required to give reasoning of your decisions. Note: In your answer/response you are required to create the updated class diagram. -firstName: string -lastName: string -userName: string -password: string -designation: string Employee +displayEmployeelnfo(): void +authenticate(user: string, pwd: string): void +calculate Salary(amount: double) +saveDataToFile(): void +logSignInActivity(): void TER TER TER TER TER TER TER TER UNREGISTERED UNREGISTER

Using UML class diagrams, create a design for the following (you can defer declaring the types for any instance variables and instance methods as long as you represent the concepts appropriately). NB: You may hand-draw your diagram or use a drawing program (your choice). Upload your finished answer for (a) and (b) as one file. (a) An Employer has one or more Employees. An Employee has exactly one Employer. Employees have attributes for their name, salary and job title (b) We are producing a vehicle registration system for the local DMV/RMV. Model the following using a UML class diagram. Read the entire specification before proceeding (this is ONE question, broken into 4 segments for readability): (i) Our interface (protocol/contract) IVehicle states that all vehicles can register() and calculateExciseTax(). These operations are public and the Vehicle contract is stable – it will not change. (ii) We think we’ll be able to take advantage of code-reuse, so your team must introduce an…