Three horseshoe magnets have worn pole markings. The tips of the first magnet are J and K, the tips of the second are L and M, and the tips of the third are N and P. Only tip M still shows its label, which reads S. In tests, tips K and L repel each other, and tips M and N attract each other.
Which pair of tips, not yet tested together, would repel each other?
tips J and P
tips L and P
tips K and P
tips J and N