The lead-acid battery used in cars today utilizes the reaction Pb + PbO2 + 2H2SO4 -> 2PbSO4 + 2H2O (P B plus P B O two plus two H two S O four yields two P B S O four plus two H two O). Identify all of the following three statements that are true as the battery discharges: 1) The voltage of the cell decreases 2) The density of the electrolyte decreases 3) The mass of at least one of the electrodes decreases