The transfer function for the state variable representation

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The transfer function for the state variable representation
Ẋ = AX + Bu, Y = CX + Du,
is given by

1. D + C(sI – A)^{– 1} B
2. B(sI – A)^{– 1} C + D
3. D(sI – A)^{– 1} B + C
4. C(sI – A)^{– 1} D + B

Correct Option: A

NA