A block of mass \( m \) is pressed against a vertical surface by a spring of unstretched length ...

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A block of mass \( m \) is pressed against a vertical surface by a spring of unstretched length \( l \). If the coefficient of friction between the block and the surface is \( \mu \). Choose the correct statement.
(1) if spring constant \( \mathrm{k}=\frac{2 \mathrm{mg}}{\mu \mathrm{d}} \), block will not be in equilibrium.
(2) if spring constant is \( k=\frac{2 \mathrm{mg}}{\mu \mathrm{d}} \), the normal reaction is \( \frac{\mathrm{mg}}{\mu} \)
(3) in the part (2) force of friction is \( 2 \mathrm{mg} \)
(4) minimum spring constant \( k_{\min } \) to keep the block of mass \( M \) in equilibrium is \( \frac{m g}{\mu d} \)
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