What Does the Phrase "Speak with a Single Voice" Mean

Multiple Choice

What does the phrase "speak with a single voice" mean? 

A)  Carefully select those tools that are most appropriate for the communications objective at hand. 
B)  Reach the target audience efficiently and effectively using touchpoints that fit the audience. 
C)  Successful marketing communications requires building relationships between brands and their consumers/customers. 
D)  All marketing communication elements should use the same endorser so that consumers do not get confused. 
E)  Coordination of messages and media is absolutely critical to achieving a strong and unified brand image and moving consumers to action.