What is all-wave radiation?

• A. Sum of shortwave and long-wave-up-dwelling radiation minus sum of shortwave and long-wave-down-dwelling radiation
• B. Sum of shortwave and long-wave-down-dwelling radiation minus sum of shortwave and long-wave-up-dwelling radiation
• C. Difference of shortwave and long-wave-up-dwelling radiation plus difference of shortwave and long-wave-down-dwelling radiation
• D. Difference of shortwave and long-wave-down-dwelling radiation plus difference of shortwave and long-wave-up-dwelling radiation