Which of the following statements is true about direct evidence?
a) It is based on the firsthand knowledge of a witness regarding the guilt of the defendant.
b) It consists of maps, diagrams, sketches, photographs, tape recordings, videotapes, X-rays, and visual tests and demonstrations produced to assist witnesses in explaining their testimony.
c) It is used in a criminal case by inferring from a series of known facts the existence of an unknown fact.
d) It includes items of physical evidence found at a crime scene, such as a weapon used to commit a homicide, a crowbar used to pry open a window, and fingerprints.
