Which is an accurate statement about the diffrent types of radiation by the sun?

Radiation with the longest wavelengths is most likely to cause wide variation in Total Solar Irradiance.
Radiation with the longest wavelenghs is emitted steadily and constantly from the sun.
Radiation with the shortest wavelenghs is most likely to cause wide variation in Total solar irradiance
Radiation with the shortest wavelenghs is emitted steadily and constantly from the sun

Radiation with the longest wavelengths is most likely to cause wide variation in Total Solar Irradiance.