A 57 yeаr оld femаle with а histоry оf bronchiectasis is about to be released from the hospital following successful treatment of an acute infection using aggressive postural drainage and percussion. The patient states that even when she is well, she coughs up cups of mucus per day. The patient lives by herself. What other alternative therapy would help this patient in secretion management?I. PEP therapyII. In-exsufflatorIII. IPVIV. flutter valve