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An applicator that directs electric current from the machine to the client's skin is a:

  1. Conductor

  2. Capacitor

  3. Electrode

  4. Transformer

The correct answer is: Electrode

This is because an electrode is a type of conductor that is specifically designed to direct electric current from a machine to the client's skin. A conductor, while able to carry electricity, does not have the specialized design of an electrode. Capacitors are used to store electrical energy and transformers are used to change the voltage of electric current. Therefore, both of these options are incorrect as they do not fit the description of an applicator that directs electric current to the skin.