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Before the main shock waves of an earthquake start, the first sound waves produced by an earthquake are of
(A) Either low frequency infrasound or high frequency ultrasound depending on the nature of earthquake
(B) Audible range of frequency for human beings
(C) Low frequency infrasound only
(D) High frequency ultrasound only
Before the main shock waves of an earthquake start, the first sound waves produced by an earthquake are of
(A) Either low frequency infrasound or high frequency ultrasound depending on the nature of earthquake
(B) Audible range of frequency for human beings
(C) Low frequency infrasound only
(D) High frequency ultrasound only
(C) Low frequency infrasound only