Which of the following devices measures the electrical activity of the heart?

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An ECG, or Electrocardiogram, is a device that measures the electrical activity of the heart.  An ECG has the ability to detect disturbances in heart rhythms as well as some mechanical issues. This test involves placing electrodes on a patient's' chest and abdomen area to detect the electrical signals that the heart is sending. This test can also be called an EKG.
An EEG is an electroencephalogram, which detects the electrical activity in the brain (Ceph= head), while an EMG is an electromyogram, which detects electrical activity in skeletal muscle. An EOG is an electrooculography test that measures electrical signal transmission within the eye.

Which of the Following Devices Measures the Electrical Activity of the Heart