NIMCET 2011 Question Paper with solutions

From options
(i) $\mathit{A}+1=1$ is boundness law
(ii) $\mathit{A}\mathit{A}=\mathit{A}$ is idernpotent law
(iii) $\mathit{A}+0=\mathit{A}$ is identity law
(iv) $\mathit{A}={\left({\mathit{A}}^{\prime }\right)}^{\prime }$ is involution law
But $\mathit{A}={\mathit{A}}^{\prime }$ is not a valid rule of Boolean algebra which is valid in matrix and is called symmetric matrix.