Question

Six persons D, E, F, M, N and O live in a six storey building but not necessarily in the same order. The bottommost floor is numbered as 1st and the topmost floor is numbered as 6th. F lives two floors above N. M lives just below O. O lives on a prime numbered floor. E lives below F but above
D. D doesn't live below
M. Who lives on 4 th floor?

A E
B M
C D
D N
E O
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