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For the standard negative feedback loop P(s) = 1/(s+1), C(s) = K, F(s) = 1 unity...

For the standard negative feedback loop P(s) = 1/(s+1), C(s) = K, F(s) = 1 unity feedback, For the standard negative feedback loop P(s) = 1/(s+1), C(s) = K, F(s) = 1 unity feedback, is it possible to tune the controller gain K so that the steady-state error e to step input disturbances DX is 0?

Always.

Never.

Yes, when K > 0.

Yes, when K > 1.

None of the above.

Yes, when K > 0. is WRONG
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