Consider the following scenario Below is the use case for the Electronics database, which is used by a university to keep track of the electronics they lend to students for their final year projects.

Information about the type of materials used are stored in the database, including the name, full reference, and size where appropriate.

Information is stored about students, including their name, student number, and the name of their supervisor for their project.

Students can borrow any number of items of each type, and they are all due back at the same date after the semester ends.

How many of each of the following are there in the relational schema? Attributes that cannot be NULL as they participate in a Primary Key: Attributes that are subject to a Referential Integrity Constraint :