please help me with the correct answer for both questions

Saved Question 4 (Mandatory) (1 point) Grapevines: a) serve no purpose. b) breed monotony in the workplace. c) are a formal communication method. d) are suprisingly accurate. Question 5 (Mandatory) (1 point) Saved Layers of hierarchy are a barrier to communication because: each level can add to, take from, qualify, or change the original message. b) top level managers hesitate to give employees unwelcome information as employees exercise power over their rewards and penalties. c) organizational hierarchy contradicts the principle of specialization. d) communication at higher levels of management is always informal and ambiguous, and the information is out of reach of the lower levels of management