$A$ speech signal of $3 kHz$ is used to modulate a carrier signal of frequency $1 MHz$,using amplitude modulation. The frequencies of the side bands will be
- A$1.003 MHz$ and $0.997 MHz$
- B$3001 kHz$ and $2997 kHz$
- C$1003 kHz$ and $1000 kHz$
- D$1.0 MHz$ and $0.997 MHz$
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