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A process is controlled by PID controller. The sensor has high, measurement noise. How can the effect be reduced?

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A process is controlled by PID controller. The sensor has high, measurement noise. How can the effect be reduced?

(a) By use of bandwidth limited derivative term

(b) By use of proportional and derivative terms in the forward path

(c) By use of high proportional band

(d) By use of low integral gain

This question was posed to me during an interview.

My query is from Design Considerations for Higher-Order Systems in section Time Response Analysis, Design Specifications and Performance Indices of Control Systems

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Correct answer is (b) By use of proportional and derivative terms in the forward path

For explanation: The effect of noise can be reduced by the use of proportional and derivative controller in the forward path.

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