What is the purpose of the inventory in a company?

I - To reflect the number of stocks in stock.
II - To control the stocks that enter or leave the warehouse.
III - To calculate the depreciation of a good.
IV - To reserve money to replace a depreciated good.
a) I and II are correct.
b) II and III are correct.
c) I, II, and IV are correct.
d) II, III, and IV are correct.