Which of the following statements regarding Interest Rates is true? (Select all that apply)

A discount factor is equal to 1/(1+rf), where rf is the discount rate.

It is considered an exchange rate across time.

If the annual interest rate is 5%, then we can exchange $1.05 in the future for $1 today.

The risk free interest rate depends on supply and demand.

The risk-free interest rate of exchange is given by the formula ( 1 - rf ).