GMDSS: Element 7

1. A 2177.5, 4210.0, 6314.0, 8416.5 12579.0, 16806.5
2. B 2182.0, 4125.0, 6215.0, 8291.0, 12290.0, 16420.0
3. C 2187.5, 4207.5, 6312.0, 8414.5, 12577.0, 16804.5
4. D 2174.5, 4177.5, 6268.0, 8376.5, 12520.0, 16695.0

Tip: press A-D to answer