Which one of the following statements related to testing of water for municipal use is correctly applicable?

• A. Pseudo-hardness is due to the presence of fluoride in water
• B. When alkalinity ≥ total hardness, Carbonate hardness in mg/l = Total hardness in mg/l
• C. Bicarbonate alkalinity = total alkalinity - (carbonate alkalinity -hydroxide alkalinity)
• D. hydroxide alkalinity = Carbonate alkalinity + Bicarbonate alkalinity