An organization needs $1,000$ units per week, noting that a year is $52$ weeks long, with a $4-$week maintenance period and an estimated waiting period of $4$ weeks. As for economic demand, it is estimated at half the annual need, and the reserve stock is sufficient. Based on this data, what is the minimum inventory?

Select one:

Unit $5000$ a

b$.16,000$ units

c Unit $4000.$

$.$ Unit $7000.$d