Which one of the following statements is true?
| 1. | Head of humerus bone articulates with acetabulum of pectoral girdle. |
| 2. | Head of humerus bone articulates with glenoid cavity of pectoral girdle. |
| 3. | Head of humerus bone articulates with a cavity called acetabulum of pelvic girdle. |
| 4. | Head of humerus bone articulates with a glenoid cavity of pelvic girdle |
