Which one of the following statements is $WRONG$?
- ARadio waves in the frequency range $10 \ MHz$ to $20 \ MHz$ are called sky waves.
- BRadio horizon of the transmitting antenna for space wave is $d_T = \sqrt{2Rh_T}$ ($R =$ radius of earth, $h_T =$ height of transmitting antenna).
- CFiber optical communication is almost free from electrical disturbances.
- DThe principle of fibre optical communication is total internal reflection.
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