Final answer:
Hydrogen cables / electron ionisation is currently not used in communicating data.
Step-by-step explanation:
The media currently NOT used in communicating data is B. Hydrogen cables / electron ionisation.
In modern communication systems, data is primarily transmitted through various media such as wireless/electromagnetic waves (option A), fiber optics/pulses of light (option C), and copper cables/electrical signals (option D). These technologies allow for efficient data transmission over long distances.