The key difference between residual income and economic value added is that EVA
  a.  uses the actual cost of capital for the company rather than a minimum required cost of capital.
  b.  uses the minimum required cost of capital for a company rather than the actual percentage cost of capital.
  c.  is a ratio rather than an absolute dollar amount.
  d.  cannot be negative.
  e.  There is no difference between residual income and EVA.