Find the correct statement/s.
(A) Hardness of water is due to the presence of calcium and magnesium salt.
(B)Permanent hardness of water can not be removed by boiling of water.
(C) Lime can also be used to remove the hardness of water.
(D) Hard water forms scum with soap.
(E) Rain water is not always hard water.
Choose the correct answer from the options given below: