Answer:
An alpha star is the brightest star in the constellation.
Explanation:
The first option is not correct because this type of star is not identified as such because of its location in the constellation.
The second option, as the first one, is not correct because the location of this type of star has nothing to do with its identification as such.
The third option is not correct because the distance from Earth is not taken into account when a star like this is identified.
The fourth option is correct because an alpha star is a star that is brightest in the constellation, and it can be located anywhere in it, and it can be of any color a star can be.
The fifth option is not correct because the color of the star can be of any type, but what matters the most is how bright it is compared to the other stars in the constellation.
