The distribution of certain test scores is a nonstandard normal distribution with a mean of 50 and a standard deviation of 6. What are the values of the mean and standard deviation after all test scores have been standardized by converting them to z-scores using z = (x - µ) / σ ?Select one:a. The mean is 0 and the standard deviation is 0.5.b. The mean is 0 and the standard deviation is 1.c. The mean is 10 and the standard deviation is 100.d. The mean is 100 and the standard deviation of 10.e. The mean is 1 and the standard deviation is 0.