A physical therapist positions a patient in supine in preparation for goniometric measurements. When measuring lateral rotation of the shoulder, where should the stationary arm of the goniometer be aligned?

1. On the lateral midline of the humerus using the lateral epicondyle as a reference 
2. Perpendicular to the floor 
3. Along the midaxillary line of the thorax 
4. Over the olecranon process

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