Three of the following pairs of the human skeletal parts are correctly matched with their respective inclusive skeletal category and one pair is not matched. Identify the non-matching pair.
| Pairs of skeletal parts | Category | |
|---|---|---|
| (1) | Humerus and ulna | Appendicular skeleton |
| (2) | Malleus and stapes | Ear ossicles |
| (3) | Sternum and Ribs | Axial skeleton |
| (4) | Clavicle and Glenoid cavity | Pelvic girdle |
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