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(a) How interpersonal communication works(b) The importance of verbal versus non-verbal interpersonal communication(c) How to get the most out of the grapevine(d) The relationship between feedback and interpersonal communication(e) How certain factors act as barriers to effective interpersonal communication.
For becoming a succesful interpersonal communicator, a manager must be able to grasp all of the following except the relationship between feedback and interpersonal communication.
(c)
Reason : The grapevine is an informal communication system and is popularly known as "rumour mill". It is not of relevance to interpersonal communication.
Hence, from above discussion, we can infer that option (c) is correct.