1- A STUDENT can take many COURSES and a COURSE can have more than one STUDENT enrolled in the course. In this case, both the "student_id" and "course_id" primary keys become foreign keys and primary keys in a new entity called COURSE-STUDENT. What is the main reason for creating a new entity?

To reinforce data accuracy

To preserve data completeness

To achieve data consistency

To eliminate possible data redundancy

2- What is a "composite" primary key?

		A set of foreign keys
		A set of two or more attributes that uniquely identifies an entity instance
		An attribute we make up when no primary key is given
		A primary key that is difficult to understand