Six students J, K, L, M, N and O appeared in several tests. Either L or O scores the highest. Whenever L scores the highest, N scores the least. Whenever O scores the highest, K scores the least. In all the tests they got different marks; M scores higher than J, but they are close competitors; J scores higher than K; L scores higher than J.

If N is ranked third, then which one of the following is correct?