Which parameter distinguishes interferential current (IFC) from traditional TENS?
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A
IFC uses direct current; TENS uses alternating current
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B
IFC uses two medium-frequency currents that interfere to produce a low-frequency beat; TENS applies low-frequency current directly
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C
IFC requires a water bath; TENS uses surface electrodes
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D
IFC penetrates only superficial tissue; TENS reaches deep muscle