I need solve this MCQ questions

Questions 1 ereydydx - (f, exax) (f* * crau). Select one: O True O False Questions 2 Jo Jo y duda = 2. Select one: O True O False Questions 3 If Vf(x, y) = (x2 - 1, Vy - 1), then f have two critical points (1, 1) and (-1, 1). Select one: O True O False Questions 4 2x + 2y 3y-+ 2x If f (a, y ) = 72 + 2xy+ 3 then Vf(x, y) = -( (x2 + 2 xy + y3) 2' (x2 + 2xy + 3) 2 Select one: O True O False