Simplify and leave the answer in exponent form. \[{{\left( \frac{6}{7} \right)}^{-2}}\times {{\left( \frac{7}{6} \right)}^{-2}}\]

• A.  \[\frac{7}{6}\]                  
• B.         \[1\]  
• C.  \[\frac{-6}{7}\]                                
• D.  \[\frac{6}{7}\]