Which one of the following statements about great circle is not correct

Which one of the following statements about ‘great circle’ is not correct?

1.  Every great circle divides the Earth into equal halves.
2.  Every great circle is a circumference of the Earth.
3.  Great circles mark the longest travel routes between locations on the Earth’s surface.
4.  Great circle is the largest circle that can be drawn around the Earth through two particular points.