A 32-year-old woman with a history of systemic lupus erythematosus (SLE) presents with generalized edema and frothy urine for the past two weeks. Laboratory tests reveal hypoalbuminemia and significant proteinuria. A renal biopsy is performed, and immunofluorescence shows granular deposits of IgG, IgA, IgM, C3, and C1q along the glomerular basement membrane. Question: Based on the patient’s presentation and biopsy findings, which class of lupus nephritis is most likely?
