When an organization implements the two-person control principle, how are tasks handled?

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When an organization implements the two-person control principle, how are tasks handled?

A task requires two individuals who review and approve the work of each other.
A task is broken down into two parts, and each part is assigned to a different individual.
A task must be completed twice by two operators who must achieve the same results.
A task is rotated among individuals within a team, each completing the entire task for a specific amount of time.