In the estimated model log ((qᵢ)) = 2.25 + 0.7 log ((pᵢ)) + 0.02(yᵢ), where (p) is the price and (q) is the demanded quantity of a certain good and (y) is disposable income, what is the meaning of the coefficient:
a) Price elasticity of demand
b) Income elasticity of demand
c) Cross-price elasticity of demand
d) Price elasticity of supply