Read the given information carefully and answer the following questions.

Six friends, A, B, C, D, E and F, are standing one after the other on a straight vertical line. All are facing towards north. A is standing at an odd position from the north. Two people are standing between D and F. D is standing at an even position from the north. Four people are standing between D and B. C is not standing behind F. E is not standing immediately after or immediately before B. F is standing ahead of D.