Question : Best URL for SEO?

Which of this url rewrite methods will work bedst to SEO?

1)
http://www.store.com/products.aspx?category=books
http://www.store.com/products.aspx?category=DVDs
http://www.store.com/products.aspx?category=CDs

2)
http://www.store.com/products.aspx/Books
http://www.store.com/products.aspx/DVDs
http://www.store.com/products.aspx/CDs

3)
http://www.store.com/products/Books.aspx
http://www.store.com/products/DVDs.aspx
http://www.store.com/products/CDs.aspx

4)
http://www.store.com/products/Books
http://www.store.com/products/DVDs
http://www.store.com/products/CDs

5)
http://www.store.com/Books.aspx
http://www.store.com/DVDs.aspx
http://www.store.com/CDs.aspx

6)
http://www.store.com/Books/
http://www.store.com/DVDs/
http://www.store.com/CDs/

Answer : Best URL for SEO?

I think 4 is best, as it implies that you have a *hierarchical* structure.

Then you can continue:

http://www.store.com/products/Books/Fantasy/Authors/JohnDoe/BookName