[fw-mvc] How to deal with Zend_Form validation errors on a form called via AJAX?

Okay, well the subject was a tough one to come up with so here is a
better description:

I have a Zend_Form... When you call the controller it renders the zend
form on the page and gives it to you.

You complete the zend form and JS packages it up and sends an Ajax request

The ajax request takes the data, creates the form, and validates, etc
that way and sends the data back

Which then gets the data back and makes a pretty table.

So my question is, how do I pass back the validation errors via the AJAX
response?

My thoughts currently are:

1) Screw the ajax, force a full page refresh each time

2) Render and pass the whole form back inside the response

3) Send back a validation error listing and parse it out in the client

#2 seems easiest, but I feel strange about it for some reason.

Anyone else tackle this before?