A child suffering from acute diarrhoea is brought to the casualty and is diagnosed as having severe dehydration with pH of 7.23. Serum Na-125, Serum K-3, HCO3 16. The best I.V. fluid of choice is -
3% Saline
N/3 Saline + 10% dextrose
Normal saline
N/3 saline + 5% dextrose