Which of the following shows that $(A{A}^T{)}^T=A{A}^T?$

$(A{A}^T{)}^T=A^{2T}{A}^T=A{A}^T$

$(A{A}^T{)}^T=A^T(A^T{)}^T=A^{T}A=A{A}^T$

$(A{A}^T{)}^T=(A^T{)}^T{A}^T=A{A}^T$

$(A{A}^T{)}^T=A^T{A}^{2T}=A^{T}A=A{A}^T$