a) Referring to chapter 4, explainthe assumption of Lead time is constant from the perspective of internal lead time and external lead time. Support each explanation with an intuitive example. b) Using the assumption of zero inventory for all components, the estimated earliest completion time for a finished good to be on hand, is found to be = X. If it was discovered that some components within the BOM currently hason hand stock or inventory level > zero, is X still valid? Justify your conclusion. Assume the two assumptions of Lead Time, discussed in chapter 4, are both valid. a) Referring to chapter 4, explainthe assumption of Lead time is constant from the perspective of internal lead time and external lead time. Support each explanation with an intuitive example. b) Using the assumption of zero inventory for all components, the estimated earliest completion time for a finished good to be on hand, is found to be = X. If it was discovered that some components within the BOM currently hason hand stock or inventory level > zero, is X still valid? Justify your conclusion. Assume the two assumptions of Lead Time, discussed in chapter 4, are both valid..