A stock pays $8 dividend one period from now. Build a two-period non-recombining binomial tree with the following parameters: S=60, u=1.15, d=0.85, r=3%. a) Price both a European and American call option with X=$60. Explain the difference, if any. b) Build a two-period recombining tree with the same parameters. Price both a European and an American call option with X=$60