Answer: Upward communication.
Explanation:
The "open door" policy that many organizations have is an example of upward communication. In this given context, the "open door" policy refers to managers leaving their door open for all employees. This encourages them to reach out and have upward communication.
Upward communication is the process of information moving up a hierarchy. In the example of the "open door" policy, this is general employees talking to their senior managers.