( A ) $\omega_{1}$ = $\omega_{0}$ and $\omega_{2}$ ≠ $\omega_{0}$
( B ) $\omega_{1}$ ≠ $\omega_{0}$ and $\omega_{2}$ = $\omega_{0}$
( C ) $\omega_{1}$ = $\omega_{0}$ and $\omega_{2}$ = $\omega_{0}$
( D ) $\omega_{1}$ ≠ $\omega_{0}$ and $\omega_{2}$ ≠ $\omega_{0}$