What factors are not taken into account when determining whether a witness may invoke the privilege against self-incrimination?

Question

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Factors such as whether the witness could have committed the crime, whether the statute of limitations has run, and the immediate setting of the testimony and other witness's testimony are all taken into account when determining whether a witness may invoke the privilege against self-incrimination. However, whether the answer will affect the witness's credibility and subject him or her to impeachment is not a factor considered when deciding whether to allow the privilege.

What Factors Are Not Taken into Account When Determining Whether