Grapevine form of communication is taking place in given statement.
Explanation:
Informal interaction is also recognized as grapevine contact, since there is no specific contact path for knowledge sharing. Knowledge corresponds a long way in this mode of communication, going from one person to the next person leaving no trace of the stage from which it began.
Such communication has been regarded as a dialog in its truest form accompanied by discussions that do not obey any defined framework or rule-based process among employees and superiors. It travels exponentially, and is likely to affect every individual in the corporation.