Optimum reorder quantity is

• A. \(\sqrt {\frac{{2\left( {annual~unit~usage} \right) \times \left( {cost~per~set - up~or~order} \right)}}{{\left( {cost~per~unit} \right) \times \left( {percent~annual~carrying~cost} \right)}}} \)
• B. \(\sqrt {\frac{{2\left( {cost~of~item} \right)}}{{\left( {annual~usage} \right) \times \left( {percent~annual~carrying~cost} \right)}}} \)
• C. \(\sqrt {\frac{{2\left( {cost~per~unit} \right) \times \left( {percent~annual~carrying~cost} \right)}}{{\left( {annual~unit~storage} \right) \times \left( {cost~per~set - up~or~order} \right)}}} \)
• D. \(\sqrt {\frac{{2\left( {cost~per~unit} \right) \times \left( {annual~carrying~cost} \right)}}{{\left( {cost~per~set - up~or~order} \right) \times \left( {percent~annual~carrying~cost} \right)}}} \)