A 67-year-old man with metastatic lung cancer presents to clinic with 3 weeks of progressive dyspnea and right-sided chest heaviness. Oxygen saturation is 94% on room air. Examination reveals dullness to percussion and absent breath sounds at the right lung base. Thoracentesis yields serosanguinous fluid with the following results:
• Pleural fluid protein: 3.1 g/dL | Serum protein: 7.0 g/dL
• Pleural fluid LDH: 118 U/L | Serum LDH: 175 U/L
• Laboratory upper limit of normal for serum LDH: 200 U/L
After calculating all three of Light's criteria parameters from the values above, which of the following correctly classifies this pleural effusion?