The c-chart below reports the incidence of supply shortages in a hospital. Are you concerned about it? 25 25 20 15 10 5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 161718192021222324252627282930 Day (unit number) UCL CL LCL I cannot answer based on the graph. O No, I am not worried at all because the indicator line (blue) is within the UCL and LCL range. I don't need to investigate the system. Yes. Even though the indicator line is within the UCL and LCL range, it shows a clear increasing trend in supply shortages, I need to investigate it.