Answer:
The correct answer is A. Witnesses can be either a professional or a nonprofessional.
Step-by-step explanation:
A witness is a person who has experienced an event with his own senses. Witnesses often appear in the judiciary to establish what has happened. Thus, witnesses are summoned by both the defense and the prosecution to testify in favor of each party, providing important data that are relevant to the judicial case.
In this way, the lawyers of each party cite witnesses who witnessed the events, but also others who can provide more technical data, such as doctors, technical experts (criminal, computer, psychological, etc.) who contribute their knowledge as information in the trial.