The Cartesian coordinates $(x,y)$ of a point $A$ with polar coordinates $\left ( 4, \pi/4 \right)$ is

- $ \left( \sqrt{3}, 2 \sqrt{2} \right ) \\$
- $ \left( 2, 2 \sqrt{3} \right ) \\$
- $ \left( 2\sqrt{2}, \sqrt{3} \right ) \\$
- $ \left( 2 \sqrt{2}, 2 \sqrt{2} \right )$