Recently, Walmart asked that Procter & Gamble $($P&G$)$ to link its computerized cash register scanning equipment and direct electronic ordering and replenishing systems to all its stores. This way, Walmart can tell P&G what merchandise it needs to replenish, along with how much, when, and to which store to deliver it on a daily basis. From this description, Walmart is engaged in $q,$

A$)$ ISO $14000$ certification.

B$)$ cause marketing.

C$)$ a supply partnership.

D$)$ sustainable development.

E$)$ ISO $9000$ certification.