Which of these can be used as a smartphone with the power of a laptop?

A. Tablet

B. E-reader

C. Note Book

D. Cell Phone

Only a, b, and d because those all have usb cords

I would go with A) Tablet because that's basically a bigger phone and mobile cmp combined, its not D) because that's a synonym for a smartphone and not C) because paper and pencil is not like a smartphone, and not B) because that's like reading online books.