What Is the Difference Between Brightness and Luminosity

Multiple Choice

What is the difference between brightness and luminosity?

A) These are different names for the same property.
B) Luminosity is how much light we see from a star; brightness is how much light it emits.
C) Brightness is how much light we see from a star; luminosity is how much light it emits.
D) Luminosity measures size; brightness measures temperature.
E) Brightness measure size; luminosity measures temperature.