Given below are two statements:
Statement (I): Potassium sulphate, a constituent of digestion mixture, used in the digestion of milk sample in Kjeldahl method of protein estimation reduces the temperature of the contents.
Statement (II): Copper sulphate, a constituent of digestion mixture, used in the digestion of milk sample in Kjeldahl method of protein estimation, serves as catalyst.
In light of the above statements, choose the most appropriate answer from the options given below.