Lead time for a product is 21 days. Demand is 100 units per day A. What would be an appropriate reorder point B: How does your answer change if demand unchanged but lead time doubles? C: How does your answer change if demand during lead time drops in half; but lead time unchanged? D: How does your answer change if demand during lead time doubles and lead time doubles? E: For the answer D. What if the safety stock requirement is 60 units, the appropriate reorder point is? \begin{tabular}{c|c|c|c|l|l} \hline & Demand & Lead time & Safety Stock & & Appropriate Reorder point \\ \hline A: & 100 & 21 & & & \\ \hline B: & 100 & 42 & & & \\ \hline C: & 50 & 21 & & & \\ \hline D: & 200 & 42 & & & \\ \hline E: & 200 & 42 & 60 & & \\ \hline \end{tabular}