QUESTION 29 What is the output of the following code? class Demo def _init_(self): self.a 1 self. b 5 def display (self): return self. b obj -Demo() print (obj.a) o a. The program has an error because there isn't any function to return self.a b. The program has an error because b is private and display(self) is returning a private member O .The program runs fine and 1 is printed o d. The program has an error as you can't name a class member using b QUESTION 30 Which of the following types of methods stores a value in a data attribute or changes its value in some other way? a. modifier constructor mutator accessor