A 60-year-old male diagnosed with multiple myeloma has laboratory tests showing Hb 72g/L, urinary protein (++), blood urea nitrogen (BUN) 16mmol/L, creatinine (Cr) 210μmol/L, IgG 36g/L, IgA 0.9g/L, IgM 0.4g/L, bone marrow plasma cells 46%, and normal findings on multiple bone X-rays. What is the clinical stage and group?