The law supports a defendant's claim of self defense against a charge of murder if they believed they were in immediate danger of being harmed or killed. Choose the facts that adequately allow a defendant to use the claim of self defense:
A. The alleged victim started shooting at the defendant first.
B. The alleged victim is a gang banger.
C. The defendant had a heated argument with the alleged victim while they were in high school.
D. The defendant is a police officer.