$A$ two-dimensional solid pattern formed by two different atoms $X$ and $Y$ is shown below. The black and white squares represent atoms $X$ and $Y,$ respectively. The simplest formula for the compound based on the unit cell from the pattern is
- A$X Y_{8}$
- B$X_{4} Y_{9}$
- C$X Y_{2}$
- D$X Y_{4}$
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