What are the medications that patients experiencing acute COPD exacerbations should receive?
1) Albuterol, antibiotics, oral corticosteroids
2) Inhaled corticosteroids, anticholinergic medications, β2-agonists
3) Intravenous corticosteroids, low-dose oral corticosteroids, antibiotics
4) Inhaled β2-agonists, ipratropium, anticholinergic medications