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

(b) Head of humerus bone articulates with the glenoid cavity of pectoral girdle. This articulation results in the formation of pall and socket joints, e.g., ball and socket joints present in shoulder while other statement are incorrect.