Database test ; Case Study In a city there is a library. To facilitate data management in the library, a system will be created that can handle transactions in the library. When borrowing books from the library, students must register first. Then the borrower's data will be stored in the database. So that the data in the system includes : >Book data, for example book code, book title, author, publisher, pages and year. >User data, for example ID, name, email, phone number and address. >Officer Data, employee id, name, position, level >Borrowing transaction data, for example borrowing id, date, book code, number of books, borrower ID, borrowing time and officer ID. >Return transaction data, borrowing id, date, book code, number of books, borrower ID, borrowing time and officer ID.

From this case, create an ER schema for the database system !