I think the answer is a although I'm not 100% sure. I think it's becuase it's natural and nothing man made has ever intervened with it
The appropriate response is false. Cathode-beam ray does not deliver pictures on the guideline of instigated emf. The cathode-ray is a high-vacuum tube in which cathode beams deliver an iridescent picture on a fluorescent screen, utilized mostly in TVs and workstations.
This question is true because it just is
B i think that the answer so