有關手部及手指變形與產生原因之配對，下列何者正確？①鈕扣孔式變形－伸肌頂罩之中央肌鍵延伸斷裂（boutonniere deformity - central tendinous slip of extensor hood rupture）　②伸肌過緊－伸指共肌在近端指間關節近端沾黏（extensor plus - adhesion of extensor digitorum communis tendon proximal to proximal interphalangeal joint）　③槌狀指－伸指肌肌腱在中節指骨斷裂（mallet finger - rupture of the extensor tendon at middle phalanx）　④扳機指－屈指肌肌腱腱鞘肥厚（trigger finger - thickening of flexor tendon sheath）