Book (ISBN, name, author, publisher, number of pages, library)

• Library is a foreign key referring to 'zip code' in 'Library'. This value can be NULL.

Library (zip_code, straat, nr, city, opening hours)

Customer (ID, name, date of birth)

Loan (ISBN, customerID)

• ISBN is a foreign key referring to 'ISBN' in 'Book' and cannot be NULL.
• customerID is a foreign key referring to 'ID' in 'Customer' and cannot be NULL.

Which statement is not correct?

		A library can be uniquely identified based on its zip code.
		A customer can loan multiple books.
		All the relations are in 2NF but not in 3NF.
		A book can be loaned by different customers.