Energy levels A, B and C of an atom correspond to increasing values of energy i.e. $E_A < E_B < E_C$. Let $\lambda_1$, $\lambda_2$ and $\lambda_3$ be the wavelengths of radiation corresponding to the transitions C to B, B to A and C to A, respectively. The correct relation between $\lambda_1$, $\lambda_2$ and $\lambda_3$ is : (A) $\lambda_1^2 + \lambda_2^2 = \lambda_3^2$ (B) $\frac{1}{\lambda_1} + \frac{1}{\lambda_2} = \frac{1}{\lambda_3}$ (C) $\lambda_1 + \lambda_2 + \lambda_3 = 0$ (D) $\lambda_1 + \lambda_2 = \lambda_3$