The value of \[\left( \mathbf{x-y} \right)\left( \mathbf{x+y} \right)\left( {{\mathbf{x}}^{\mathbf{2}}}\mathbf{+}{{\mathbf{y}}^{\mathbf{2}}} \right)\mathbf{\{}{{\left( {{\mathbf{x}}^{\mathbf{2}}}\mathbf{+}{{\mathbf{y}}^{\mathbf{2}}} \right)}^{\mathbf{2}}}\mathbf{-2}{{\mathbf{x}}^{\mathbf{2}}}{{\mathbf{y}}^{\mathbf{2}}}\mathbf{\}}\] is:

• A. \[{{x}^{8}}-{{y}^{8}}\]
• B. \[{{x}^{8}}+{{y}^{8}}\]
• C. \[{{x}^{6}}-{{y}^{6}}\]
• D. \[{{x}^{6}}+{{y}^{6}}\]
• E. None of these