a$.$ Consider the book reservation database on that handout: Which of the following is correct about the ISBN column in the OOK RESERVATION table?

It is part of the composite primary key of the BOOK RESERVATION table.

It is a non$-$key attribute in the BOOK RESERVATION table.

It is the only entire primary key of the BOOK RESERVATION table.

It is one of the two entire primary keys of the BOOK RESERVATION table

b$.$ Consider the clothing store database on that handout: If each customer can purchase multiple products and each product can be purchased by multiple customers, what should be the cardinality of the relationship between tables CUSTOMER and PRODUCT?

One$-$to$-$many relationship with table CUSTOMER on the many side

One$-$one relationship.

Many$-$to$-$many relationship.

One$-$to$-$many relationship with table PRODUCT on the side