b$)$ What do you understand by the term Operating Doctrine of inventory? Explain.

c$)$ Write short notes on the following

i$)$ Order Cost

ii$)$ Carrying Cost

iii$)$ Procurement Cost

iv$)$ Shortage Cost

d$)$ Write short notes on the following

i$)$ Stock Replenishment

ii$)($b$)$ Re$-$Order Period $($ROP$)$

iii$)$ Re$-$Order Quantity $($ROQ$)$

iv$)$ Lead Time