Answer the following questions:

The Clark-Wilson model is an integrity model that can be applied to transaction processing systems. Using the student registration system described below,

Scenario: The student system keeps track of students, their schedules, and their grades. Each student has a name, an ID, student coordinator, a favourite kind of pizza, a planned course of study, and a transcript. At the beginning of every term the student proposes a planned course of study to coordinator, who reviews it, either approving it or rejecting it. Courses have instructors. At the end of a term the instructor assigns a grade, and the course moves from the planned course of study to the transcript. The system maintains two invariants: the course of study is agreed to by the student and their coordinator and all grades are assigned by the appropriate instructor.

Based on the student registration system scenario, answer following questions:

1) Briefly explain and identify the subjects in the scenario? (2 Marks)

2) Briefly explain and identify constraint data items (2 Mark)

3) Briefly explain and identify unconstrained data items. (2 Marks)

please explain the answers