Using the Notation of the Text,the CAPM States:
A) $$\bar { R } _ { i } = R _ { f } + \beta _ { i } \left( \bar { R } _ { M } - R _ { f } \right) ( 1 - \tau )$$

Using the notation of the text,the CAPM states:

A) $$\bar { R } _ { i } = R _ { f } + \beta _ { i } \left( \bar { R } _ { M } - R _ { f } \right) ( 1 - \tau )$$
B) $$\bar { R } _ { i } = \lambda R _ { f } + \beta _ { i } \left( \bar { R } _ { M } - R _ { f } \right) ( 1 - \lambda )$$
C) $$\bar { R } _ { i } = R _ { f } + \beta _ { i } \left( \bar { R } _ { M } - R _ { f } \right)$$
D) None of the above