The key fact is The Maximum Usable Frequency for communications between two points. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.
The official correct answer for G3B08 is The Maximum Usable Frequency for communications between two points.
The key fact is The Maximum Usable Frequency for communications between two points. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.