The Excess Return Form of the Single-Index Market Model Is $\alpha$

Multiple Choice

The excess return form of the single-index market model is

A) R_it = $\alpha$ + b(R_mt - R_it) + e_it.
B) RFR_t = $\alpha$ + b(R_mt -RFR_t) + e_it.
C) R_it -RFR_t = $\alpha$ + b(R_mt) + e_it.
D) R_it = $\alpha$ + b(R_mt - RFR_t) + e_it.
E) R_it - RFR_t = $\alpha$ + b(R_mt - RFR_t) + e_it.