$A$ telephonic communication service is working at a carrier frequency of $20 GHz$. Only $20 \%$ of it is utilized for transmission. If each channel requires a bandwidth of $5 kHz$,then the number of telephonic channels that can be transmitted simultaneously are
- A$6 \times 10^5$
- B$2 \times 10^5$
- C$8 \times 10^5$
- D$4 \times 10^5$
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