I think E-Book is correct, but any of them is okay.
My Kindle goes back to its customary position on top out my computer whenever I'm not reading it. That way I know where it's and that's where the charger is plugged in anyway.
I have eaten while reading on my Kindle, and splattered taco sauce all over the keyboard. It cleaned off easy enough but seemed to fade the white paint a little. I try not to do that any more.