A second-order band-pass activefilter can be obtained by cascading a low pass second order section having cutoff frequency $$f_{OH}$$ with a high pass second ordersection having cut-off frequency $$f_{OL}$$, provided

A

$$f_{OH} > f_{OL}$$

B

$$f_{OH} < f_{OL}$$

C

$$f_{OH} = f_{OL}$$

D

$$f_{OH} \leq \frac{1}{2} f_{OL}$$