CAN YOU PROVIDE THE LOGIC BEHIND THE ANSWER PLEASE. How can one invest today at the $2-$year forward rate of interest?

I$)$ By buying a $2-$year bond and selling a $1-$year bond with the same coupon

II$)$ By buying a $1-$year bond and selling a $2-$year bond with the same coupon

III$)$ By buying a $1-$year bond and then after a year reinvesting in a further $1-$year bond