Assertion (A): The load place at the top of the screw in a mechanical screw jack is prevented from rotation by providing a swiveling mechanism.
Reason (R): When the screw in a mechanical screw jack rotates, the load kept on top of it moves axially.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true