Please help me with this

Question 3 f (z) _ J 2 for a

Question d Let f be the function defined above. Which of the following statements js true? f is not differentiable at c 5 because f is not continuous at X = 5. 2cd forc f is not differentiable at a: 5 because the graph of f has a sharp comer atc 5. f is not differentiable at c = 5 because the graph of f has a vertical tangent at c 5. f is not differentiable at 5 because fis not defined at c