To "Lay the Foundation" for the Admission of a Gun

Multiple Choice

To "lay the foundation" for the admission of a gun the police believe is the murder weapon, the prosecution must:

A) call expert witnesses to establish the DNA on the gun matches the defendant's DNA.
B) call expert witnesses to establish that the a bullet fired by this gun killed the victim.
C) call lay witnesses to establish where the gun was found and what has been done with it since the police found it.
D) all of these