$A$ signal of frequency $3 \text{ kHz}$ is amplitude modulated on a carrier wave of frequency $2.5 \text{ MHz}$. The upper and lower sideband frequencies in the resultant signal are
- A$2500 \text{ kHz}, 2503 \text{ kHz}$
- B$2503 \text{ kHz}, 2497 \text{ kHz}$
- C$2.5 \text{ MHz}, 3 \text{ kHz}$
- D$5.5 \text{ MHz}, 0.5 \text{ MHz}$
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