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Dividing a task into segments and then assigning each segment to different person by specialty is known as:
Least privileges
Multi factor tasking
Separation of duties
None of these
Edited the question for clarity. Separation of duties occurs when there are specific functions each person does usually by department. The original question said "breaking a task into pieces..." there was no indication that each piece was any different than the other. Without a differentiation between the pieces this is not separation of duties.
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