1. If you do not know the answer, do not make something up, just say
you do not know.
2. Once you do know, tell the truth. All of it, even if it makes you look bad.
Folks are more willing to forgive bad judgement, than a "cover up" . The truth will come out anyway.
Creditability , is what makes the Bible so unique and believable. There are no "cover ups" in the Bible. In tells all of the story, the good and the bad about individuals. David's sin with Bathsheba, Moses not making it into the promised land, Peter's denying Jesus three times.