The short answer is: probably in Word format.
The longer answer: however they want it. And that’s something you should check, just in case they’re expecting you to submit HTML, Pages files or post-it notes.
This question falls within the realm of ‘assumptions’. There are certain things that you might assume about an agreement with a client, such as:
- file formats
- delivery dates
- review process
- sign-off process.
Instead of assuming that your 100th client will be like the other 99, define the specifics of your project so there are no unexpressed assumptions and no nasty surprises.