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Only 2% of the optical source frequency ...

Only 2% of the optical source frequency is the available channel bandwidth for an optical communicating system operating at 1000 nm. If an audio signal requires a bandwidth of 8 kHz, how many channels can be accommodated for transmission :

A

`375 xx 10^7`

B

`75 xx 10^7`

C

`375 xx 10^8`

D

`75 xx 10^8`

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