56-year-old type 2 DM patient on metformin, NPH and enalapril presented with bilateral leg swelling of 2 weeks duration. BP-150/90, 5Cr-3.4mg/dl and K+= 6.5 ECG shown peaked T waves. What is the next initial step in management? A Hold metformin and enalapril B. Give Calcium gluconate 1096 C. Intravenous Lasix D. Repeat serum electrolyte and RFT