O The half plane y The cone z = The cone z Q17 1 Point Let f ( r, y. z ) be such that Vf (P) # 0. Which of the following statements about V f(P) is false? O Vf (P) indicates the direction of fastest ascent at P O Vf (P) is the maximum value of Duf ( P) OVf (P) is orthogonal to the level surface f (x, y, 2) = 0 O All of the alghiye are true Q18 I as it moves