Bull, I'm gonna teach you something. Not in malace, but for your education and so others might learn something also. You are still willing to learn "new" things, right? 
Yes, one can have a "verbal" response in written form. I partially quote Cynthia Messon from" E-how."
"Believe it or not, writing is considered a form of verbal communication because words are involved." The writing can be in electronic form, e-mails, books, faxes (et al) and any other item that contains a written message is considered verbal communation." Raising hands or waving arms is an unwritten form of communication because no words are used.
Now see what you learned, just because you poked me without knowing you were incorrect. Speaking of thin skin.....I almost sent this as a PM, but I figured, what the hey, you never miss a chance to poke me in public, why skip the fun.
Diane you appear to be teaching the wrong thing, I'd suggest you stick to studying a good English dictionary before teaching any further.
So you consider Cynthia Messon from" E-how" some kind of Expert. She also wrote How to Remove Nail Polish Stains From a Rug on By Cynthia Measom, eHow Contributor. That Is just a plain pathetic! Using someone as an expert who simply writes all over the Internet on what ever subject they choose to write on. She is a nobody! I learned years ago to be careful what advice I read on the Internet.
There appears to be, from the definition of each word to a considerable misunderstanding of the English language as if it were a foreign language.
I sure hope you weren't teaching English to children in school!
Here are the definitions Diane according to the proper experts on the English language:
Both definitions from Merriam-Webster
1 ver·bal adjective \ˈvər-bəl\
: relating to or consisting of words
:
spoken rather than written: relating to or formed from a verb
2: something written: as
a :
letters or characters that serve as visible signs of ideas, words, or symbols
the activity or skill of marking coherent words on paper and composing text.
"parents want schools to concentrate on reading, writing, and arithmetic"
See the big difference between just someone on the internet quoted with no internet link and Merriam Webster.