Can someone check pls

B vi. Which x value(s) correspond to local minimums. a) -infinity b) 2 6 d) 2 & 6 2. At a local maximum point f '(x) = 0. A (a) always b) sometimes c) never 3. If f '(x) = 0, then the point (x, f(x)) is an extreme point. B Jayalways b) sometimes c) never 4. If f '(x) = 0 and f"(x)