A physical therapist works on various balance tasks with a patient who has known balance deficits. The patient has intact visual and vestibular systems, though has deficits with somatosensory inputs. Which of the following activities would be MOST useful in improving utilization of the somatosensory system to maintain balance?

1. Standing on a firm surface with eyes open
2. Standing on a firm surface with eyes closed
3. Standing on a foam pad with eyes open
4. Standing on one leg with eyes open

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