Which of the following statements best describes the process of an electrocardiograph recording an electrocardiogram in the form of five or six waves labeled P, Q, R, S, T, and sometimes U?
A) It measures and amplifies the electrical changes in the heart muscle to create a visual representation of heart activity.
B) It uses ultrasound technology to map out the electrical activity of the heart muscle and generate a waveform.
C) It transmits electrical signals to the heart to stimulate specific wave patterns, which are then recorded and analyzed.
D) It scans the heart for magnetic anomalies that indicate potential heart rhythm irregularities, producing a waveform for analysis.