A block of base 10 ~cm × 10 ~cm and height 15 ~cm is kept on an...

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1. Aat $\theta=30^{\circ}$, the block will start sliding down the plane
2. Bthe block will remain at rest on the plane up to certain $\theta$ and then it will topple
3. Cat $\theta=60^{\circ}$, the block will start sliding down the plane and continue to do so at higher angles
4. Dat $\theta=60^{\circ}$, the block will start sliding down the plane and on further increasing $\theta$, it will topple at certain $\theta$