Forced expiratory technique, or “huff” cough, is most useful…

Forced expiratory technique, or “huff” cough, is most useful in which of the following disease processes?        1.  Cystic Fibrosis and Bronchiectasis        2.  COPD, Cystic Fibrosis, and Bronchiectasis        3.  Cerebral Palsy, ALS, and Cystic Fibrosis        4.  Cerebral Palsy and Bronchiectasis