In which of the following circumstances are there no reasonable grounds for putting the question to the…

A, a barrister, is told by a solicitor that an important witness is a dacoit. The barrister asks the question "Are you a dacoit?"

An advocate is informed by a person in court that an important witness is a dacoit. The informant on being questioned by the advocate gives satisfactory reasons for his statement. The advocate asks this question, "Are you a dacoit?"

A witness of whom nothing whatever is known is asked at random whether he is a dacoit

A witness of whom nothing whatever is known on being questioned as to his mode of life and means of living gives unsatisfactory answers. The witness is asked, "Are you a dacoit?"