The difference between the formulae used in the computations of CPI and GDP deflator is a) The CPI uses a Laspeyer Index, whereas the GDP deflator uses a Paasche index b) The CPluses a Paasche Index, whereas the GDP deflator uses a Laspeyer index c) The CPI uses a geometric mean of price relatives, whereas the GDP deflator uses an arithmetic average d) The CPI uses an arithmetic average of price relatives, whereas the GDP deflator uses a geometric mean