Identify two entities and 2 of their attributes from the given scenario. Book is an online virtual store on the Internet where customers can browse the catalog and select products of interest.

a. Every book has a title, ISBN, year and price. The store also keeps the author and publisher for any book.
b. For authors, the database keeps the name, address and the URL of their homepage.
c. For publishers, the database keeps the name, address, phone number and the URL of their website.
d. The store has several warehouses, each of which has a code, address and phone number.
e. The warehouse stocks several books. A book may be stocked at multiple warehouses.
f. The database records the number of copies of a book stocked at various warehouses.
g. The bookstore keeps the name, address, email-id, and phone number of its customers.