What is the interest rate parity formula?

Multiple choice question.

Forward exchange rate $=$ Spot exchange rate$/(1+$ if$)(1+$ id$)$

Forward exchange rate $=$ Spot exchange rate $(1+$ id$)(1+$ if$)$

Forward exchange rate$/$Spot exchange rate $=(1+$ if$)/(1+$ id$)$

Forward exchange rate$/$Spot exchange rate $=(1+$ id$)/(1+$ if$)$