The correct response is:
The sun has a relatively average apparent magnitude and the highest luminosity.
However, please note that while the Sun's luminosity is indeed high compared to many other stars in terms of absolute magnitude, it is not the highest among all stars, especially when considering the most luminous stars in the universe. Therefore, a more accurate statement would recognize that the Sun has a relatively average luminosity compared to the entire range of stars.
The Sun's apparent magnitude is average when considering its brightness as observed from Earth, but in the grand context of all stars, its luminosity is relatively typical, not the highest.
Thus, the best option should be:
The sun has a relatively average apparent magnitude and a relatively average luminosity.
Be sure to clarify the distinction between these attributes based on context.