Center eases norms for sewage plants. Which fact is true in this regard?

• A. Sewage treatment plants built after June 2019 will only have to meet 30 mg/litre biochemical oxygen demand, but large state capitals and metropolitan cities will be out of this purview.
• B. The biochemical oxygen demand limit for new sewage treatment plants to be set up in state capitals has been fixed at 20 mg/litre.
• C. (1) and (2) both
• D. neither of the above