Which of the following statements is TRUE of a fixed$-$quantity system $($FQS$)?$

Select one:

a$.$

It orders a fixed quantity of items at the time of review to bring the inventory position up to the replenishment level.

b$.$

It orders a fixed quantity of items when the inventory position reaches or drops below the reorder point.

c$.$

It orders sufficient stock at the time of review to bring the inventory position up to the replenishment level.

d$.$

It orders a fixed quantity of items when the inventory position reaches or drops below the replenishment level.

e$.$

It orders sufficient stock at the time of review when the inventory position reaches or drops below the reorder point.