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. t of For $3$ months consumption estion Based on this data, what is the minimum inventory? Select one: a$.7000$ units Unit $5000.16,000$ units d$.4000$ units