Assertion (A): The surface area of largest sphere that can be inscribed in a hollow cube of side is ra².cm².
Reason (R): The surface area of a sphere of radius r is 4/3 πr³
(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 the correct explanation of A.
(c) A is true, R is false.
(d) A is false, R is true.