Except as otherwise provided by statute:
(a) No person has a privilege to refuse to be a witness.
(b) No person has a privilege to refuse to disclose any matter or to refuse to produce any writing, object, or other thing.
(c) No person has a privilege that another shall not be a witness or shall not disclose any matter or shall not produce any writing, object, or other thing.
(Enacted by Stats. 1965, Ch. 299.)