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The required bandwidth of the preamplifier used in cell counter must be?

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The required bandwidth of the preamplifier used in cell counter must be?

(a) 70 kHz

(b) 120 kHz

(c) 70 Hz

(d) 120 Hz

I had been asked this question in an online quiz.

My enquiry is from Transmission of Video Images topic in section Telemedicine Technology of Biomedical Instrumentation

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Correct choice is (a) 70 kHz

The explanation is: The electronic circuit must have upper frequency response greater than 70 kHz. The preamplifier used in cell counters must be of very low noise preferably having noise voltage less than 2 nA at the required bandwidth of 70 kHz.

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