In a fabric manufacturing factory, the quality control process using control charts from SPC. In an hour there are a total of 5 samples are taken each having 4 observations regarding the thickness of fabric in measured in millimeters. In a particular hour, the sample means (X-bar) are noted to be: 156.46, 199.62. 189.31, 102.22, and 112.09 respectively. In the same sample, the corresponding ranges are: 1197, 1217.13.94, 11.86, and 11.83 respectively. What are the lower and upper controllimits for the chart? O a. 0,28.17 O b. 0. 30.47 OC 0,31.17 Od 0.24.71 e. 0.29.17 of None is correct