In a situation with positive feedback, the control mechanisms act in order to increase the original stimulus from its normal value. Therefore, the option D holds true.
A control mechanism can be referred to or considered as a mechanism which is considered as relevant for the provision of feedback to the user. However, the increase or decrease in an original stimulus depends on whether the feedback is positive or negative, respectively.
Therefore, the option D holds true and states regarding the significance of positive feedback control mechanism.
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