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Boolean expression for the output of $\text{XNOR}$ (Equivalent) logic gate with inputs $A$ and $B$ is

1. $\mathrm{A} \overline{\mathrm{B}}+\overline{\mathrm{A}} \mathrm{B}$
2. $\overline{\mathrm{AB}}+\mathrm{AB}$
3. $(\overline{\mathrm{A}}+\mathrm{B})(\mathrm{A}+\overline{\mathrm{B}})$
4. $(\overline{\mathrm{A}}+\overline{\mathrm{B}})(\mathrm{A}+\mathrm{B})$