Find the value of the determinant $\begin{vmatrix}a-b & b+c & a\\b-c & c+a & b\\c-a & a+b & c\end{vmatrix}$

Question

$\begin{array}{1 1} \quad a^3+b^3+c^3 \\ \quad 3bc \\ \quad a^3+b^3+c^3-3abc \\ \text{none of these} \end{array} $