Which of the following statement(s) is(are) correct?

I) N(x) function in the Black-Scholes formula is the cumulative normal distribuition function.

II) N(x) function in the Black-Scholes formula is the probability that a random number from a standard normal distribution is less than x.

III) For N(x) function in the Black-Scholes formula, 1-N(x) = N(-x)

I only

I and II only

II and III only

all of above.