Choose the statements that are TRUE about a function f that is defined and differentiable at all the points in question: The definition of the derivative of fat x is f (x) = lim f (u). f(x) - f(a) The derivative of f at a can be calculated by f (a) = lim f(z) - f(a) O The derivative of f at a is T- a f(x) - f(x + h) O The derivative of f at x can be calculated as f (x) = lim h-0 h flat h) - f(a) O The derivative of f at a can be calculated as f (a) = lim ha h f(x th) - f(x) O The derivative of f at x can be calculate by f (x) = lim h-0 h