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IIR filter design by approximation of derivatives has the limitations

1) Used only for transforming analog high pass filters
2) Used for band pass filters having smaller resonant frequencies
3) Used only for transforming analog low pass filters
4) Used for band pass filters having high resonant frequencies

A. 1, 2 and 3 are correct

B. 1 and 2 are correct

C. 2 and 3 are correct

D. All the four are correct

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