Answer: It meets at 90, and it passes through the midpoint.
Explanation:
It isn't the first option because there is no distance between the line and it's bisector
It meets at AB because at a 90 degree angle because it perpendicular
Because of that, it can't also meet at a 180 degree angle
because its a bisector, it would not pass through A or B
It must meet line AB to bisect it
And because it bisects the line, it would also pass through the midpoint.