Design an ER Diagram for a small system which records the exam held and the students who have attended the exam. It should record the student_id, name, phone, and email address of the students who appear in the exam. For exams, it should record the room where the exam was held along with the date and subject of the exam. Also, you should record the exam in the record card where you mention the record number, subject for which exam is recorded, and total score of that exam. The name of students made of first_name and last_name together. Please represent the composite attributed accordingly wherever appropriate