The correct options are
A A police official taking a bribe to solve a case
B The RTO officer giving a license to a person who has gifted them a car
D A collector stealing some of the government funds
Democratic institutions should be free of corruption. At least, for the most part. However, this has not been the case with all democracies. Instances of bribing officials to get their work done fall under corruption. A collector stealing government funds would also be a corrupt move. Impartial judgements are passed by non-corrupt judges.