In the Black-Scholes Model, N(d1) is equal to ______
A. the probability that a standardized, normally distributed, random variable will be greater than or equal to d1.
b. the probability that a standardized, normally distributed, random variable will be greater than d1.
c. the probability that a standardized, normally distributed, random variable will be less than or equal to d1.
d. the probability that a standardized, normally distributed, random variable will be less than d1.