For the function f(x) = - x', find f"(x). f"(0), f"(1), and f"(-1). f" (x) = Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. f"(0) = (Type an integer or a simplified fraction.) O B. f"(0) is undefined. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. f"(1)= (Type an integer or a simplified fraction.) O B. f"(1) is undefined. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. f"(-1)= (Type an integer or a simplified fraction.) O B. f"(- 1) is undefined