Question 3. (40 pts) Expert Systems Construct a rule-based expert system for students, who are deciding whether to register for a course or not. The decision will be based on the following factors: . . whether the course is mandatory or elective, whether the student has failed the course before or not, how difficult the course is, number of homework assignments in the course, number of students who failed the course the year before. . The system produces one of the following decisions: (register for the course, do not register, audit the course, take the course as pass/fail) Express the system as a decision tree with a minimum depth of 3