Identify the fair and the unfair electoral practices among the following:

(i) A minister flags off a new train in his constituency a week before polling day.

(ii) A candidate promises that she will get a new train for her constituency if she is elected.

(iii) Supporters of a candidate take the voters to a temple and make them take an oath that they will vote for him.

(iv) The supporters of a candidate distribute blankets in slums in return for a promise to vote.