The Central Statistical Organisation (CSO) is the government body that measures India's Gross Domestic Product (GDP). It reports GDP in two standard ways: at "constant prices", where the value of goods is measured using a fixed base year, so we can compare real growth without the effect of price rise, and at "current prices", where the value is measured using the prices of the same year, which includes the effect of inflation. "Historical prices" is an accounting term used for valuing fixed assets in a company's books, and it is not a way the CSO reports national GDP. Let's check the options with this in mind.
Since the CSO always reports GDP at both constant prices (for real growth) and current prices (for nominal value), the correct choice is "A, B".
Let's summarize:
The answer is option (1), A and B.