Automation. ... It involves taking a machine or software that was taught to do simple repetitive tasks (traditional automation) and teaching it to intuitively adapt or correct its performance based on changing conditions, at speed and scale.
The answer to your question is,
D) Check their pulse.
((Well, some people say to place your ear over the persons mouth and watch for a rise and fall of the chest-- but that's not an answer nor does that really go with any of the answers provided so..))
-Mabel <3