If $\mathrm{A}=\left\{\mathrm{x}, \mathrm{y}\right\}$ then the power set of A is

• A

  $\left\{{\mathrm{x}}^{\mathrm{x}}, {\mathrm{y}}^{\mathrm{y}}\right\}$

• B

  $\left\{\varnothing , \mathrm{x}, \mathrm{y}\right\}$

• C

  $\left\{\varnothing , \left\{\mathrm{x}\right\}, \left\{2\mathrm{y}\right\}\right\}$

• D

  $\left\{\varnothing , \left\{\mathrm{x}\right\}, \left\{\mathrm{y}\right\}, \left\{\mathrm{x}, \mathrm{y}\right\}\right\}$