At f) be a function defined on r s.t. f(x) = max {x -1|, x, |x|} and lets = {x e r f(x) = xx 3. then a) s is closed but not compact. b) s is connected (c) s is

at f) be a function defined on R s.t. f(x) = max {x -1|, x, |x|} and letS = {x e R f(x) = Xx 3. Then A) S is closed but not compact. B) S is connected (C) S is open (D) S is countable.