Which of the following statements is correct?

a) The demand for sunglasses is elastic. This means a small increase in price of sunglasses will cause its demand to decrease significantly

b) Vu always spends $20 buying bananas every week, regardless of the price of bananas. Vu's demand for bananas is, therefore, perfectly inelastic

c) The price elasticity of demand for low-fat milk is estimated to be -2.07. Since -2.07 is lower than 1, the demand for low-fat milk is inelastic.

d) None of the above (i.e. All of the above statements are incorrect).