please include all that are true only

The following questions about els based on the information provided. The PC Inc. buys circuits boards for its computer assembly annual demand, units/yr (D) 10,000 order cost or setup cost, per order (O) $90 0.20 inventory carrying costs (annual) as of unit cost, %, (1) unit cost, per unit (C) $40 lead time (Days) (LT) 1 safety stock, units (SS) 0 days of a calendar year 250 daily production (in units) 60 O the maximum inventory is 274 time lapse per production run (days) is 14 the reorder interval (days) is 12 the total production runs per year are 21 U the annual inventory carrying costs & order costs are $2,191 the average inventory is 137 els is $822 the reorder point is $40