4. Consider the graph of function f (x): -6/ a) at x = 2 f(x) A) is continuous and differentiable B) is not continuous but differentiable C) is continuous and non-differentiable 2 D) is not continuous and non-differentiable 6 b) at x = 3 f(x) A) is continuous and the limit exists B) is not continuous but the limit exists C) is continuous but the limit does not exist D) is not continuous and the limit does not exist c) at x = 4 f(x) A) is continuous and differentiable B) is not continuous but differentiable C) is continuous but non-differentiable D) is not continuous and non-differentiable