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.