please please answer these question as soon as possible

Which of the following is NOT a method of improving reliability? System design Component design Disassembly techniques Testing O Providing redundancy The first step in designing control charts is: Determining a sample size Establishing control limits. Obtaining over 25 samples Interviewing potential customers The p-chart is a: Control chart that helps better understand where defects come from. Control chart used to monitor the number of defects per unit. Control chart used to better understand the upper limits of the specific industries standard deviation. Control chart used to monitor the proportion of defectives in a process