21. which communications management practice includes specifying all of the communications systems and platforms that parties will use to share information?

Agreements

Explanation:

People that are communicating through agreements are considering ideas, behavior, and attitudes.

This is a powerful and one of the main communication tools because it can affirm the platforms and communication systems that are used for information sharing.

Some examples of agreements are ''Always do you best'', ''Don't make assumptions'', ''Be skeptical but learn to listen''.

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.