The mean of a set of credit scores is 4-690 and

which statement must be true?

a. o z690 is within 1 standard deviation of the mean
b. 2690 is between 1 and 2 standard deviations of the mean.
c. z690 is between 2 and 3 standard deviations of the mean.
d. z690 is more than 3 standard deviations of the mean.