A change in photosynthesis as a function of ambient intercellular $\mathrm{CO}_{2}$ concentration is

Question

A change in photosynthesis as a function of ambient intercellular $\mathrm{CO}_{2}$ concentration is plotted in case of two different plants $X$ and $Y$. The partial pressure at which $\mathrm{CO}_{2}$ assimilation is zero defines the $\mathrm{CO}_{2}$ compensation point.\ Based on the given figure, which of the following statements are correct?\ P. $X$ represents $C_{4}$ plant.\ Q. Increasing $\mathrm{CO}_{2}$ concentration above compensation point stimulates photosynthesis over a wide concentration range in plant $Y$, hence it is $C_{3}$ plant.\ R. Increasing $\mathrm{CO}_{2}$ concentration above compensation point stimulates photosynthesis over a wide concentration range in plant $Y$, hence it is $C_{4}$ plant.\ S. $ \mathrm{CO}_{2}$ compensation point of $X$ is higher than $Y$.\

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(c)