Which of the following definitions best describes pulsed current?
a. Pulsed current is a type of electrical current that flows intermittently, with periods of high and low intensity.
b. Pulsed current is a type of alternating current that varies in intensity and frequency.
c. Pulsed current is a type of direct current that is delivered in short, concentrated bursts.
d. Pulsed current is a type of electrical current that is modulated to create specific physiological effects.