1.

The filter that may not be realized by approximation of derivatives techniques are1) Band pass filters2) High pass filters3) Low pass filters4) Band reject filters

A. 1, 2 and 3 are correct
B. 2 and 4 are correct
C. 2 and 3 are correct
D. All the four are correct
Answer» C. 2 and 3 are correct


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