Discussion
An ideal filter is the one which has :
Answer: A
An ideal filter has zero attenuation in the pass band.
An ideal filter passes every frequency in its pass band without any loss and completely blocks every frequency in its stop (reject) band, with an abrupt transition between them. Zero attenuation in the pass band is therefore one defining property; the other is infinite attenuation in the reject band.
Zero attenuation in the reject band would let unwanted frequencies through, infinite attenuation in the pass band would block the wanted ones, and finite attenuation in the reject band is what practical, not ideal, filters show.
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