Answer:
Downward communication
Step-by-step explanation:
Downward communication in a formal structure is the flow of information in terms of orders, appreciation, encouragement from higher authority to subordinates across the organization.
Upward communication in the form of feedback and problems flow from lower level employees to upper level. Here, the board of directors are top level employees who have passed the message to the employees to raise the level of service. This is a form of downward communication.