4. Evaluate the MAD-1 Problem on Page 649 of your textbook. What is a) the non value-added lead time in the process of checking patients in until their arrival in the clinical area and b) the value added ratio of the entire process (rounded to 1 decimal place), respectively? A) 60min and 25.0% B) 45min and 43.8% C) 55min and 31.3% D) 50min and 37.5%