what is the answer to this? & how do I figure it out?

Select the correct answer. Given line A B and a point P that is not on line A B, which step is part of constructing a perpendicular line to line AB from point P using a pencil tied to a string? Secure push-pin at point A on the line. Set string length from point A to point P. Secure push-pin at point P. Set string length past the line. Secure push-pin at point A on the line. Set string length past point P. Secure push-pin at point P. Set string length from point P to the line. Submit Reset