3. A teacher is keeping his student records in a doubly circular linked list where each node represents the student number, student name and student CGPA. (a) (\%3) Write an appropriate node structure definition for the records of the doubly circular linked list. (b) (\%11) Write the definition of a function called Createlist to create a list based on the data entered by the user. The user will enter the records of the students one by one and will enter a negative CGPA to stop the entry process. Note that the function returns a pointer to the header of the list. (c) (\%11) Write another function called AverageStudent which finds and displays the student with average performance in the class. The student with the average performance is the one who has a CGPA that is closest to the average CGPA of the class