If \[\mathbf{a=}\frac{\sqrt{\mathbf{5}}\mathbf{-}\sqrt{\mathbf{3}}}{\sqrt{\mathbf{5}}\mathbf{+}\sqrt{\mathbf{3}}}\]and \[\mathbf{b=}\frac{\sqrt{\mathbf{5}}\mathbf{+}\sqrt{\mathbf{3}}}{\sqrt{\mathbf{5}}\mathbf{-}\sqrt{\mathbf{3}}}\] then the value of \[\frac{{{\mathbf{a}}^{\mathbf{2}}}\mathbf{-ab+}{{\mathbf{b}}^{\mathbf{2}}}}{{{\mathbf{a}}^{\mathbf{2}}}\mathbf{+ab+}{{\mathbf{b}}^{\mathbf{2}}}}\mathbf{=?}\]

• A.  \[\frac{63}{61}\]          
• B.  \[\frac{67}{65}\]
• C.  \[\frac{65}{63}\]                                  
• D.  \[\frac{69}{67}\]