Which of the following definitions can be used to define the term ‘offset’ as a characteri

Which of the following definitions can be used to define the term ‘offset’ as a characteristic of controller action？

A.The period of time in which the set point and the control point coincide

B.The periodic change between the set point and the control point

C.The variable difference between the set point and the control point

D.The constant difference between the set point and the control point

请帮忙给出正确答案和分析，谢谢！