Ann: Bonus Issue of Options - Letter to Eligible Shareholders, page-2

I've got a question for anyone who's exercised options like this before:

It's done through the share registry (in this case Automic) right? It says in the letter there's no brokerage fees to exercise. Are there usually any other fees? Like a processing fee from the registry or anything like that?

Can the options be exercised in any quantity at any time? Is there a minimum limit to stop you exercising just one option?

How do you pay for the exercising of these options? Does money get sent to Automic?

Thanks I've never had any options before so it's a bit new for me.