When measuring the brightness of a star, what is a limitation of using apparent magnitude rather than absolute brightness? Apparent magnitude does not use the star's color or temperature.

Apparent magnitude is only theoretical, thus its value cannot be directly measured with equipment.

Apparent magnitude does not take into account the fact that not all stars are the same distance from Earth.

Apparent magnitude is only on a comparative scale that determines how bright a star looks from a theoretical distance of 32 light-years from Earth.