A 72-year-old with COPD presents with 36 hours of increased dyspnea, increased sputum volume, and purulent sputum. He is afebrile, SpO2 92% on room air, and chest radiograph shows no infiltrate. Which initial regimen is most appropriate?APrednisone 20 mg daily for 14 days plus azithromycin 5 days.BPrednisone 40 mg daily for 5 days and start antibiotics due to the three cardinal symptoms.CBegin an inhaled corticosteroid/long-acting beta-agonist only; no oral steroids or antibiotics.DWithhold antibiotics unless procalcitonin >1 ng/mL.EPrednisone 1 mg/kg for 10 days; avoid antibiotics unless ICU.Check my answer