Which of the following statements about price elasticity of demand is correct

please Select one:

a.Price elasticity of demand is measured by the absolute change in quantity demanded divided by the absolute change in price.

b.Price elasticity of demand is equal to the slope of the demand curve.

c.Elastic demand implies that there are many close substitutes.

d.The higher the price elasticity of demand, the steeper the demand curve.

e.Elastic demand implies a firm's high market power.