Which statement describes one acid-base theory?
(1) An acid is an H+ acceptor, and a base is an H+ donor.

(2) An acid is an H+ donor,. and a base is an H+ acceptor.

(3) An acid is an H- acceptor, and a base is an H-donor.

(4) An acid is an H- donor, and a base is an H­ acceptor.