among six friends - a, b, c, d, e and f-three are wearing blue dresses, two are wearing red dresses and one is wearing a green dress. three of them are employed, two are unemployed and one a student. also, three of them own only a bicycle each, two of them own only a scooter each and one owns only a mobike. for any person, each of the three features, i.e., the colour of their dress, their employment status and the kind of their vehicle, is henceforth referred to as an attribute of that person. it is known that except c and d, no two friends have more than one attribute in common. further, the following information is known: i. c, who does not wear a blue dress, does not have the same kind of vehicle as a. ii. each of the four persons a, b, d and e have exactly one attribute in common with the person who owns the kind of vehicle which no other person owns. iii. for a, b and f, there is one attribute common to all three of them and that is not the colour of dress