Which one of the following statement is correct?

• Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
• The rate of transfer of radiant energy is called flux and is expressed in watts.
• The radiant energy which falls upon a surface, is termed as irradiance.
• The radiant energy which falls away from the surface is termed as radient exitance and is measured in Wm-2
• All of these