(A) 20000 to 30000 hertz
(B) 10 to 20 hertz
(C) 2000 to 4000 hertz
(D) 6000 to 8000 hertz
(A) 20000 to 30000 hertz
(B) 10 to 20 hertz
(C) 2000 to 4000 hertz
(D) 6000 to 8000 hertz
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