Develop a class PO$.$ An object of this class represents an examination regulation for a course of study. It should have three properties: a name of the course of study, which is represented by a character string, an enumeration object that indicates whether it is a Bachelor's or Master's course of study and the year in which the examination regulation came into force. You also need to define an enumeration class. Write a constructor that initializes all fields. Override the equals method in an appropriate manner. Override the toString method