Which of the following statements about communications related to change management is most accurate?

A、 Communication should flow from key business subject matter experts to upper management.
B、 The communication plan for implementing change should place equal emphasis on business objectives and information technology (IT) processes.
C、 Communication should flow both directions between all levels within the organization and key messages should be repeated frequently.
D、 Communication should flow down from upper management to ensure focus on the business directives.