$A$ message signal of frequency $14 kHz$ is used to modulate a carrier of frequency $900 kHz$. The frequencies of the sidebands are:
- A$914 kHz, 886 kHz$
- B$920 kHz, 880 kHz$
- C$907 kHz, 893 kHz$
- D$900 kHz, 914 kHz$
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