What is the difference between a standard normal distribution and a nonstandard normal distribution? choose the correct answer below. a. the standard normal distribution has a standard deviation that is less than or equal to the mean, while a nonstandard normal distribution has a standard deviation that is greater than the mean. b. the standard normal distribution has a mean of 0 and a standard deviation of 1, while a nonstandard normal distribution has a different value for one or both of those parameters. c. the standard normal distribution has a standard deviation that is greater than the mean, while a nonstandard normal distribution has a standard deviation that is less than or equal to the mean. d. the standard normal distribution has a mean of 1 and a standard deviation of 0, while a nonstandard normal distribution has a different value for one or both of those parameters.