Line segment AB is shown on a coordinate grid: The line segment is reflected about the y-axis to form A^ prime B^ prime . Which statement describes A^ prime B^ prime ? (4 points ) O A^ prime B^ prime and AB are equal in length . O A^ prime B^ prime ' and AB are perpendicular . A^ prime B^ prime ' is greater than twice the length of AB. O A^ prime B^ prime is half the length of AB