WILL GIVE 20 POINTS [BWS.03] One group of students is investigating the properties of the bar magnet shown below.

Bar magnet

The students' observations are listed below.

When an iron nail is taken near the North Pole (N) of the bar magnet, it is pulled towards the magnet.
When an iron nail is taken near the South Pole (S) of the bar magnet, it is pulled towards the magnet.

The experiment was repeated by several students using different bar magnets. Based on the investigations, which of these theories would the students most likely propose?
magnets attract iron nails
the poles of a magnet attract all materials
iron nails are attracted towards all materials
iron nails have the same properties as magnets