Estimates of a Stock's Beta May Vary Depending on

Multiple Choice

Estimates of a stock's beta may vary depending on
I. when the estimate was made
II. the standard deviation of the stock's returns
III. how many months of returns were used to estimate the beta
IV. the index used to represent market returns.

A) I, II and IV only
B) II and IV only
C) I, III and IV only
D) I, II and III only