Which of the following statements are true about the Black-Scholes- Merton model? i. The interest rate used in the formula is the continuously compounded rate. ii. The model can used to price both European and American options. iii. The model assumes constant volatility of the stock. O a. i and in Ob. i and iii O c. ii and lii O d. i, ii, and iii are all true O e. i, ii, and ii are all false