Based on an analysis of the current process stability, process capability (Yield and/or PPM Defective) and other stratification variables recorded, which of the following would you most likely recommend for future monitoring of this process? Note: May wish to consider creating other types of control charts based on the available information. Group of answer choices a. Continue to use the current sampling plan as the process is in-statistical control and the Yield is greater than 99% In-Specification b. Use the same plan for collecting data (2 per batch) but switch to an X-bar and Range chart to more quickly identify out-control conditions c. Change their sampling plan to include at least one part per cavity to form a subgroup until they can demonstrate that all four cavities are producing consistent parts d. Adopt 100% inspection for all parts as currently they are producing nearly 20% out-of-specification with no systematic causes for their high variation