Suppose that the index model for stocks A and B is estimated from excess returns with the following results:

RA = 0.03 + 0.7 RM + eA

RB = -0.02+ 1.2 RM + eB

M =0.20;

R-square A = 0.25

R-square B = 0.12

What is the standard deviation of A & B, respectively?

Group of answer choices

0.28, 0.69

0.69, 0.28

0.50, 0.35

0.35,0.50