The diagram shows four magnetic compasses placed at the same distance from a central point YYY.

The north-seeking end of each compass needle points in the following direction:
Which of the following is most likely to be located at point YYY?
a straight wire carrying conventional current perpendicular to and out of the page
a straight wire carrying conventional current perpendicular to and into the page
a permanent bar magnet oriented vertically with its North pole at the top
a flat circular current-carrying coil parallel to the page