A 72-year-old man with COPD (FEV₁ 40% predicted) presents with a 3-day history of increased dyspnoea, purulent sputum, and wheeze. On exam, he is tachypnoeic with widespread wheezes but normal blood pressure and no confusion; SpO₂ is 90% on room air. According to Canadian COPD pharmacotherapy guidance, which combination best reflects initial management of this acute exacerbation in the emergency department?