When calculating the CAPM, [Rj = Rf + Bj(Rm-Rf)], what number should you use for the Rf rate if only these rates are available:

A)The current yield on a 1 month treasury security.

B)The historic yield on 1 month treasury securities.

C)The current yield on a 6 month treasury security.

D)The historic yield on 6 month treasury securities.

E)The current yield on a 1 year treasury security.

F)The historic yield on 1 year treasury securities.