Customer$-$driven marketing usually works well when $\_\_\_\_\_\_\_\_$ and when customers $\_\_\_\_\_\_\_\_.$

$2$ points

A$)$ a clear need exists; are difficult to identify

B$)$ a clear need exists; know what they want

C$)$ a need exists; don't know what they want

D$)$ a firm can deliver the goods desired; are thoroughly researched

E$)$ customers know what they want; are loyal to the brand