For the answer to the question above, <span>A </span>plumb bob<span>, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or </span>plumb<span>-line. It is essentially the vertical equivalent of a "water level".</span>
Answer:C) Feedback
Explanation: System control is the controlling and managing activity of the system by commands ,regulations, management practices etc.It helps in the analyzation of the system and improving the ability of performing the tasks.Feedback is the component of the control system that is obtained as the output after the controlling technique is applied in the system.
Other options are incorrect because environment is the surrounding of the system ,interface is the connection between the components of the system and boundary is not a technical term of control system.Thus, the correct option is option(C).
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