A 52-year-old man from Delhi presents with blurred vision in both eyes for 3 days. He has a 8-year history of hypertension poorly controlled on amlodipine monotherapy. On examination, blood pressure is 178/112 mmHg. Fundoscopy reveals flame-shaped hemorrhages, cotton-wool spots, hard exudates arranged in a macular star pattern, and blurred disc margins. Serum creatinine is 2.1 mg/dL (baseline 0.9 mg/dL). What is the Keith-Wagener-Barker grade of hypertensive retinopathy in this patient?