Read this portion of an outline from a passage.
I. Print books and E-books
A. Print Books
1. Physicality of print books
2. Environmental friendliness of print books
3. Cost of print books
4. Convenience of print books
B. E-books
1. Physicality of e-books
2. Environmental friendliness of e-books
3. Cost of e-books
4. Convenience of e-books

What are the points of comparison used in this passage?

O the history of all books, the history of digital books, and the history of print books

the passage first talks all about books printed on paper and then all about e-books

physicality, environmental friendliness, cost, and convenience

weightlessness, ease of transport, and ease of use​