A displacement vector of magnitude $4$ makes an angle $30^{\circ}$ with the $x$-axis. Its rectangular components in $x-y$ plane are .........

  • A

    $2 \sqrt{3}, 2$

  • B

    $4 \sqrt{3}, 4$

  • C

    $\frac{2}{\sqrt{3}}, 2$

  • D

    $\frac{4}{\sqrt{3}}, 4$

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