You are using a fixed time$-$period inventory model. You are carrying huge amounts of safety stock despite setting a modest $80\%$ service level, it is probably because

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There is probably a lot of demand variance in this system

The fixed time period model does not include safety stock

The cost of overestimating is greater than cost of underestimating demand, so I should order more than the average

There is probably a lot of lead time variance in this system

There is not enough information given to answer this question