Which of the following statements about showing a witness's bias is correct?

The correct choice highlights that to show a witness's bias, a party typically needs to first establish that bias during cross-examination. This is important because bias can significantly affect the credibility of a witness; thus, the opportunity to question the witness on their potential motivations or predispositions is critical in unearthing such bias.

In the context of trial procedure, cross-examination serves as a means for a party to challenge the witness's testimony and to delve into areas that may reveal the witness's predisposition or partiality. This could include exploring relationships, interests, or any other factors that may color the witness's perceptions or testimonies.

Establishing bias during cross-examination allows for an effective strategy to undermine the credibility of the witness. Once bias is brought to light through direct questioning, additional evidence or inquiry may then follow or support that bias if necessary.

In contrast, the other options discuss ideas that do not correctly reflect the principles of evidence regarding the demonstration of a witness's bias and may mislead regarding proper evidentiary procedures.