Seven boxes J, K, L, M, N, O, and P are kept in a stack from top to bottom but not necessarily in the same order. Box J is kept at fifth position from bottom of the stack. Three boxes are kept between M and J. Box K is just above J. There are two boxes between N and L which is just above box O. Box N is at one of the positions above box L. which of the following pair denotes boxes kept at the topmost and bottommost position?