Only \( 2 \% \) of the optical source frequency is the available channel bandwidth for an optica...

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Only \( 2 \% \) of the optical source frequency is the available channel bandwidth for an optical communicating system operating at \( 1000 \mathrm{~nm} \). If an audio signal requires a bandwidth of \( 8 \mathrm{kHz} \). how many channel can be accomodated for transmission:
(a) \( 375 \times 10^{7}(b) 75 \times 10^{7} \)
(c) \( 375 \times 10^{8}(d) \)
\( 75 \times 10^{9} \)
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