The term grapevine refers to an unofficial,informal communication network within organisations. Information travels quickly through personal conversations rather than authorised channels. The stem describes communication spreading rapidly via personal contacts,which clearly points to the grapevine.
Option A:
The grapevine may transmit both accurate information and rumours and often operates parallel to formal communication structures. Its speed and informality match the description given,which supports this option.
Option B:
A formal chain refers to officially designated routes in the hierarchy,such as reporting lines,which is opposite to the informal nature highlighted.
Option C:
A bulletin board is a physical or digital display space and does not itself describe an interpersonal network.
Option D:
An official memo is a documented formal message and not part of the informal grapevine system.
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