What term describes the condition in which the brain, heart, and lungs have all completely stopped functioning?

Explanation

Option A refers to clinical death, which is the cessation of heartbeat and breathing but may be reversible. Option B, somatic death, is the death of the body as a whole. Option C, systematic death, implies the failure of bodily systems. Since all these terms relate to the cessation of vital functions, the correct answer is D, all of the above.