Which of the Following Statements Best Describes Formal and Informal

Which of the following statements best describes formal and informal communication channels?

A) All relevant organizational information should flow through formal communication channels.
B) A free exchange of information within organizations should be avoided because it can lead to chaos.
C) Managers should do everything possible to avoid grapevine communication within an organization.
D) Companies should monitor social media sites to see what customers and others are saying about the company.