Please Check My Answer :)Which line must be perpendicular to GH?1. IJ2. CD3. EF4. AB

Answer:4. AB Step-by-step explanation:In the diagram, we see that the angle formed by the intersection of AB and EF is marked as a right angle.  The angle formed by the intersection of AB and GH is also marked as a right angle, as is the angle formed by the intersection of AB and IJ.  This means that AB is perpendicular to all three lines, since perpendicular means it meets at a right angle.