"I not only use all the brains that I have, but all I can borrow.

I not only use all the brains that I have, but all that I can borrow.
I not only use all the brains that I have, but all that I can borrow.
I not only use all the brains that I have, but all that I can borrow.
I not only use all the brains that I have, but all that I can borrow.