In the arrangement shown in the figure. The mass of wedge \( A \) and that of the block \( B \) ...

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In the arrangement shown in the figure. The mass of wedge \( A \) and that of the block \( B \) are \( 3 \mathrm{~m} \) and \( \mathrm{m} \) respectively. Friction exists between \( A \) and \( B \) only. The mass of the block \( C \) is \( m \). The force \( F=19.5 \mathrm{~m} \times g \) is applied on the block \( C \) as shown in the figure. The minimum coefficient of friction \( (\mu) \) between \( A \) and \( B \) so that \( B \) remains stationary with respect to wedge \( A \) will be
(a) \( \frac{2}{5} \)
(b) \( \frac{1}{10} \)
(c) \( \frac{2}{5} \)
(d) \( \frac{1}{4} \)
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