Consider a One-Factor HJM Model Where the Initial Forward Curve $T$

Consider a one-factor HJM model where the initial forward curve is given as 6% for one year and 7% between one and two years.The evolution of continuously-compounded one-year forward rates beginning at time $T$ ,is given by the following binomial process: $f ( t + 1 , T ) = f ( t , T ) + \alpha \pm 0.02$ ,where the up and down movements are equiprobable.What is the $\alpha$ value for $f ( 1,1 )$ ?

A) $- 0.0001$
B) $- 0.0002$
C) $+ 0.0001$
D) $+ 0.0002$