Which of the following frequencies have NOT been designated for "On-scene" communications in the Global Maritime Distress and Safety System?

Correct Answer: Option C — NBDP on 2182.0 kHz

2182 kHz is the international distress, safety, and calling frequency for MF radiotelephony. NBDP (Narrow Band Direct Printing) is not authorized on this frequency because it would cause harmful interference to voice distress communications. On-scene communications utilize specific designated frequencies to ensure clear coordination during SAR operations.