Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e. \[{{E}_{A}}

• A.   \[{{\lambda }_{3}}={{\lambda }_{1}}+{{\lambda }_{2}}\]    
• B.   \[{{\lambda }_{3}}=\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\]
• C.   \[{{\lambda }_{1}}+{{\lambda }_{2}}+{{\lambda }_{3}}=0\]      
• D.   \[\lambda _{3}^{2}=\lambda _{1}^{2}+\lambda _{2}^{2}\]