If A = \(\left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&1 \end{array}} \right]\)and B = \(\left[ {\begin{array}{*{20}{c}} 1&{ 1}\\ { 1}&1 \end{array}} \right]\), then the value of AB is

• A. \(\left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&1 \end{array}} \right]\)
• B. \(\left[ {\begin{array}{*{20}{c}} 0&{ 1}\\ { 1}&0 \end{array}} \right]\)
• C. \(\left[ {\begin{array}{*{20}{c}} -1&{ 0}\\ { 0}&-1 \end{array}} \right]\)
• D. \(\left[ {\begin{array}{*{20}{c}} 0&{ 0}\\ { 0}&0 \end{array}} \right]\)