A principal sum of money, P, is invested at a nominal interest rate, r, and compounded m times per year for t years. What amount, F, will be accumulated at the end of this period of time. Answer is____. (a) F = P (1 + r/m)^r (b) F = P (1 + r/m)^t/m (c) F = P (1 + r/m)^m/r (d) F = P (1 + r/m)^m (e) F = P (1 + r/m)^rm (f) none of the above