Strategic sourcing, among other things, means $\_\_\_\_.$

A$.$

choosing suppliers so wisely that little long$-$term planning is necessary

B$.$

supplier and purchasing department functions are kept separate.

C$.$

choosing suppliers so wisely that there needs to be little interaction between buyer and supplier.

D$.$

the purchasing department needs to be integrated along with other key departments into the total functioning of the company.

E$.$

the purchasing department is so sophisticated that it need not worry about being integrated along with other key departments into the total functioning of the company.