As you arrive at a metal scrap yard for an unknown medical emergency, you observe a male patient supine on the ground with AED electrodes on his chest. The AED operator has just ordered coworkers to clear the patient because the AED is going to shock. Within seconds, the AED delivers a shock without the operator pressing a "shock" button. The AEMT should recognize what type of AED?

A) Fully automated
B) Manual
C) Biphasic
D) Semi-automated

Answer: A