Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below :
(a) Both A and R are true and R is correct explanation of the assertion.
(b) Both A and R are true but R is not the correct explanation of the assertion.
(c) A is true but R is false.
(d) A is false but R is true.
    Assertion : Copper is used to make hot water tanks and not steel.
   Reason : Copper is a better conductor of heat than steel and it is fairly resistant to corrosion than steel.