1) C++: Design a class or set of classes for use in a program that maintains a class roster. For each student, store the student's name, id, and final grade score in the range 0-100. The program wil allow student records to be added or removed, display the record of a particular student, identitied by id, with the grade displayed as a number and a:s a letter, and display the average score for the class. The appropriate letter grade for a particular score is: 93-100 A, 90-92 A-, 87-89 B+, 83-86 B, 80-82 B-,77- 79 C+, 73-76 C, 70-72 C-, 67-69 D+, 60-66 D, 0-59F