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Which statement describes the two types of reactions that occur in operating electrochemical cells?
(1) Nonspontaneous reactions occur in voltaic cells, and spontaneous reactions occur in electrolytic cells.
(2) Nonspontaneous reactions occur in electrolytic cells, and nonspontaneous reactions occur in voltaic cells.
(3) Spontaneous reactions occur in voltaic cells, and nonspontaneous reactions occur in electrolytic cells.
(4) Spontaneous reactions occur in electrolytic cells, and spontaneous reactions occur in voltaic cells.