Consider the Regression Equation

Consider the regression equation:
R_i - r_f = g₀ + g₁b_i + e_it
Where:
R_i - r_f = the average difference between the monthly return on stock i and the monthly risk-free rate
B_i = the beta of stock i.
This regression equation is used to estimate __________.

A) the security characteristic line
B) the security market line
C) the capital market line
D) a and b
E) a,b,and c