What Is the Difference Between Apparent Brightness and Luminosity

Multiple Choice

What is the difference between apparent brightness and luminosity?

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