G2C04:What does the Q signal “QRL?” mean?
Direct answer summary (2023-2027 NCVEC pool)
The official correct answer for G2C04 is “Are you busy?” or “Is this frequency in use?”.
The key fact is “Are you busy?” or “Is this frequency in use?”. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.