An object of mass $M_1$ moving horizontally with speed $u$ collides elastically with another object of mass $M_2$ at rest. Select the correct statement.
- AThe momentum of the system is conserved only in the direction $PQ$.
- BThe momentum of $M_1$ is conserved in the direction perpendicular to $SR$.
- CThe momentum of $M_2$ will change in the direction normal to $CR$.
- DAll of these.
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