A block of base 10 cm $$\times$$ 10 cm and height 15 cm is kept on an inclined plane. The coefficient of friction between them is $$\sqrt{3}$$. The inclination $$\theta$$ of this inclined plane from the horizontal plane is gradually increased from $$0^\circ$$. Then

at $$\theta = 30^\circ$$, the block will start sliding down the plane

the block will remain at rest on the plane up to certain $$\theta$$ and then it will topple

at $$\theta = 60^\circ$$, the block will start sliding down the plane and continue to do so at higher angles

at $$\theta = 60^\circ$$, the block will start sliding down the plane and on further increasing $$\theta$$, it will topple at certain $$\theta$$