A Quality Analyst wants to construct a control chart for determining whether four machines, all producing the same product, are under control with regard to a particular quality attribute. Accordingly, the analyst inspected 1,000 units of output from each machine in random samples, with the following results: Machine #1 #2 #3 #4 Total Defectives 23 15 29 13 If upper and lower control limits were set as 0.028 and 0.010, which machine(s), if any, appear(s) to be out-of-control for process proportion of defectives? O a. Machine #3 only O b. Machine #4 only