Which of the following statements are incorrect ?

a) The cost of capital depends primarily on the use of the funds, not the source

b) The average in WACC is = the required rate of return on firm's assets based on market's perception of the risk of those assets

c) The WACC weights are determined by how much each type of financing is used

d) Firms with riskier projects generally have a lower WACC

e) A firm must earn at least the required return to compensate investors for the financing they have provided