Let f(:r., y) be a function that is differentiable on the entire plane, R2 01.1 5 Points Let be the vectorwith initial point (1, 3) and terminal point (4, 1) Whatis Dal, 3) o Vf(4, 1)o o Vin1,3). o Vf(1,3)o o Vf(4, 1). 0 None of the Above 01.2 5 Points What is the minimum value of the directional derivative at (1, 3) O IIVf(-1s3)|| O -||V.f{-1:3)|| O 0 0 It will depend on whether the function is positive or negative at (1, 3) 0 None of the above 01.3 5 Points Suppose one of the level curves of f, sayr f(, y) = 6. is lfwe letti't =. then what is Df(_1!3) Hint: The level curve is a circle, and note that the point (-1, 3) is on the level curve, and the position vector is perpendicular to this circle. 0 IIVf(-1:3)|| O -||V.f{-1,3)|| O 0 0 It will depend on whether the function is positive or negative at (1, 3) 0 None of the above