Which method would be most organised for giving different instructions to separate departments in a large company?

Correct answer: Department-specific written messages

The governing concept is organised, targeted communication. Department-specific written messages can state the exact task, deadline, responsibility, and expected result for each group. They also provide a record that managers can review later, reducing confusion and overlap. Therefore option A is correct. One vague announcement may not address each department’s role, rumours are unreliable, and posters alone cannot provide all the necessary detail or accountability.