Which of the following correctly states De Morgan's theorems?

Question

Accepted Answer

$\overline{xy} = \bar{x}+\bar{y}$ and $\overline{x+y} = \bar{x}\bar{y}$

Answer

$\overline{xy} = \bar{x}\bar{y}$ and $\overline{x+y} = \bar{x}+\bar{y}$

Answer

$\overline{xy} = x+y$ and $\overline{x+y} = xy$

Answer

$\overline{xy} = \bar{x}\bar{y}$ and $\overline{x+y} = \bar{x}+\bar{y}$ only