Huckaby Motor Services, Inc. rebuilds small electrical items such as motors, alternators, and transformers, all using a certain type of copper wire. The firm's demand for this wire is approximately normal, averaging $20$ spools per week, with a standard deviation of $6$ spools per week. Cost per spool is $$24$; ordering costs are $$25$ per order; inventory handling cost is $$4\mathrm{.}00$ per spool per year. Acquisition lead time is four weeks. The company works $50,5-$day weeks per year. What is the safety stock if the desired service level is $90\%($i$.$e$.,$ Z $=1\mathrm{.}28)?$Group of answer choicesbetween $100$ and $115$ spoolsless than $16$ spoolsbetween $90$ and $96$ spoolsbetween $20$ and $25$ spools