Which of the Following Is a Disadvantage of Informal Communications

Which of the following is a disadvantage of informal communications?

A) Managers can easily interrupt the flow of information which the employees may believe to be important.
B) Good news may spread very rapidly through the informal channel.
C) It flows through the chain of command.
D) Rumours and distorted or inaccurate information may be flowing through the grapevine at a fast rate.
E) Studies have shown that the rumours and gossip on the grapevine are almost always accurate.