$A$ message signal of frequency $100\, MHz$ and peak voltage $100\, V$ is used to execute amplitude modulation on a carrier wave of frequency $300\, GHz$ and peak voltage $400\, V$. The modulation index and difference between the two sideband frequencies are:
- A$0.25 ; 2\times10^8\, Hz$
- B$4 ; 1\times10^8\, Hz$
- C$0.25 ; 1\times10^8\, Hz$
- D$4 ; 2\times10^8\, Hz$
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