Which action can a witness take to ensure their testimony is reliable in court?

A witness can ensure their testimony is reliable in court by documenting their observations immediately. This practice preserves the accuracy of their recollections, as memories can fade or become distorted over time. Recording observations while the events are still fresh in their minds helps in maintaining the integrity of the details and ensures that the information shared in court is as factual and precise as possible.

Additionally, immediate documentation can provide a reference point that can substantiate the witness's account during legal proceedings, making their testimony more credible and reliable. This method contrasts with some of the other options, which could lead to less reliable testimonies. For instance, discussing details with the media can introduce external biases or influence the witness’s account. Rehearsing statements with others can lead to altered memories or pressure to conform, undermining the authenticity of the testimony. Changing one’s story under pressure can severely compromise the credibility of the witness, making it difficult to ascertain the truth.