Q27Multiple choiceLet f (x) = 1 + x 2 , then(A)f (xy) = f (x) . f (y)(B)f (xy) ≥ f (x) . f (y)(C)f (xy) ≤ f (x) . f (y)(D)None of these [Hint : find f (xy) = 1+ x 2 y 2 , f (x) . f (y) = 1+ x 2 y 2 + x 2 + y 2 ]