Material requirements planning $($MRP$)$ systems use different lot$-$sizing rules to balance ordering frequency and inventory levels. Which of the following is an MRP lot$-$sizing rule that aims to reduce the average inventory level?

Fixed order quantity $($FOQ$)$

Lot for lot $($L$4$L$)$

Economic order quantity $($EOQ$)$

Periodic order quantity $($POQ$),$ with $P=5$

Periodic order quantity $($POQ$),$ with $P=2$