**Core Concept**
Automated external defibrillators (AEDs) are portable, user-friendly devices used to restore a normal heartbeat in individuals experiencing cardiac arrest or life-threatening arrhythmias.

**Why the Correct Answer is Right**
The correct answer, Automated External Defibrillator (AED), accurately describes the purpose and functionality of the device. AEDs use electrical currents to convert abnormal heart rhythms (arrhythmias) to a normal sinus rhythm. They are designed for layperson use, eliminating the need for medical expertise to operate the device. The term "Automated" indicates that the device can analyze the heart rhythm and deliver an electric shock if necessary, while "External" specifies that the device is used on the outside of the body.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because "Automatic" implies the device can operate independently without human intervention, whereas AEDs require user input and confirmation before delivering a shock.
**Option C:** Incorrect because "Electrical" is too general, as AEDs do not simply provide electrical stimulation but rather use a specific type of electrical current to restore a normal heartbeat.
**Option D:** Incorrect because "Automated" is correct, but "Electrical" is again too general and does not accurately describe the device's purpose.

**Clinical Pearl / High-Yield Fact**
AEDs are now widely available in public spaces, such as shopping malls, airports, and public buildings, and should be used promptly in cases of cardiac arrest.

**✓ Correct Answer: B. Automated external defibrillator**