Consider an optical communication system operating at `lambda ~ 800 nm`. Suppose, only 1% of the optical source frequency is the available channel band-width for optical communication. Channels which can be accommodated for transmitting video TV signals requiring an approximate band-width of 4.5 MHz are

Options

A. `408 xx 10^2`
B. `804 xx 10^4`
C. `48 xx 10^3`
D. `840 xx 10^3`.