\( A, B \) and \( C \) are three tuning forks. Frequency of \( A \) is \( 350 \mathrm{~Hz} \). B...

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\( A, B \) and \( C \) are three tuning forks. Frequency of \( A \) is \( 350 \mathrm{~Hz} \). Beats produced by \( A \) and \( B \) are \( 5 / \mathrm{s} \) and by \( B \) and \( C \) are \( 4 / \mathrm{s} \). When a wax is put on \( A \) beat frequency between \( A \) and \( B \) is \( 2 \mathrm{~Hz} \) and between \( A \) and \( C \) is \( 6 \mathrm{~Hz} \). Then, frequency of \( B \) and \( C \) respectively, are
(a) \( 355 \mathrm{~Hz}, 349 \mathrm{~Hz} \)
(b) \( 345 \mathrm{~Hz}, 341 \mathrm{~Hz} \)
(c) \( 355 \mathrm{~Hz}, 341 \mathrm{~Hz} \)
(d) \( 345 \mathrm{~Hz}, 349 \mathrm{~Hz} \)
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