Formal communication follows officially prescribed channels and formats within an organisation. A memo from the registrar to department heads is an official written instruction moving through hierarchical lines. This clearly represents formal communication.
Option A:
Informal communication occurs through casual talk and personal networks,not through official memoranda.
Option B:
Formal communication follows authorised channels and standard formats,which is exactly what an official memo represents.
Option C:
Grapevine communication is unofficial and often based on rumours,so it does not describe an official memo.
Option D:
Mass communication involves media organisations addressing large public audiences,not internal administrative notices.
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