A telephonic communication service is working at carrier frequency of 10 GHz. Only 10% of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz?

Question

( A ) $2 \times 10^4$
( B ) $2 \times 10^5$
( C ) $2 \times 10^8$
( D ) $2 \times 10^3$