A 28-year-old woman with SLE presents with nephrotic-range proteinuria (4.2 g/day), hematuria with RBC casts, and serum creatinine 2.1 mg/dL. Kidney biopsy shows endocapillary and extracapillary proliferation with fibrinoid necrosis and "wire loop" lesions on light microscopy. The pathology is consistent with the class of lupus nephritis marked **B** in the diagram. Which of the following is the most appropriate INDUCTION therapy for this patient according to current KDIGO 2024 guidelines?