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We created in class a Person class to represent a person. The class has instance variables for a person’s name, which is a string, and an integer age. These variables are name and age, respectively. a. Write a default constructor for Person that sets name to the string "No name yet" and age to zero. b. Write a second constructor for Person that sets name to a given string and age to a given age. c. Write a static method createAdult() for Person that returns a special instance of this class. The instance represents a generic adult and has the name “An adult” and the age 21.