Consider the following statements about the text:

I. Nowadays people pay more attention to how a book looks like than before. This popularity of beautiful covers and books is a characteristic of the last few years.

II. According to the author, the success of book sales is only related to the design of their covers.

III. The author mentions that when there is an effort to design a beautiful cover it indicates that the content of the book may also be important.

Which ones are in agreement with the text?