নিচের কোনটি ভেক্টরের বিনিময় সূত্র?

$\overrightarrow{\mathrm{P}}(\overrightarrow{\mathrm{Q}}+\overrightarrow{\mathrm{R}})=\overrightarrow{\mathrm{P}} \cdot \overrightarrow{\mathrm{Q}}+\overrightarrow{\mathrm{P}} \cdot \overrightarrow{\mathrm{R}}$

$\overrightarrow{\mathrm{P}}+\overrightarrow{\mathrm{Q}}=\overrightarrow{\mathrm{Q}}+\overrightarrow{\mathrm{P}}$

$(\overrightarrow{\mathrm{P}}+\overrightarrow{\mathrm{Q}})+\overrightarrow{\mathrm{R}}=\overrightarrow{\mathrm{P}}+(\overrightarrow{\mathrm{Q}}+\overrightarrow{\mathrm{R}})$

$\overrightarrow{\mathrm{P}}+\overrightarrow{\mathrm{Q}}=\overrightarrow{\mathrm{P}} \cdot \overrightarrow{\mathrm{Q}}$