saying thanks to someone answering your email ASAP who is important for you [closed]

Which of these sentences sounds more american? and which sounds more polite against who is important for you like a professor or boss?

first:

Thanks for your prompt response

second:

Thanks for your quick answer

third:

Thanks for your fast reply

Solution 1:

Personally I would say;

Thanks for getting back to me so quickly.

This is casual but still serious. It is American and respectful.