The interest rate parity approximation formula is:

A、F t = S 0 × [1 + (R FC × RUS)] t .
B、F t = S 0 × [1 - (R FC - RUS )] t .
C、F t = S 0 × [1 + (R FC - RUS )] t .
D、F t = S 0 × [1 + (R FC + RUS)] t .
E、 F t = S 0 × [1 - (R FC + RUS)] t .