Find the gradient vector at the point P. f (x, y) = 5 x arctan X P (2, 2) 5 a) OVf(2, 2) = -- 4 + NIU 5 It b) OVf ( 2, 2 ) = i - NIU NIU C. 4 5 It c) OVf (2, 2) = NIU i + NIU 4 5 n d) OVf(2, 2) = li + NIU 4 e) OVf(2, 2) = 5 TC 4 f) O None of these