What Is the Difference Between "Luminosity" and "Flux

What is the difference between "luminosity" and "flux"?

A) Flux is determined by energy in the visible wavelengths only; luminosity is computed all across the spectrum.
B) Luminosity is the rate at which energy is emitted from an entire object; flux is luminosity per unit area.
C) Flux is the rate at which energy is emitted from an entire object; luminosity is flux per unit area.
D) They are the same thing.

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