Which of the Following Statements Is Not True Concerning the Attributes

Which of the following statements is not true concerning the attributes of z-scores?

A) z-scores are equal to zero for data values equal to the mean of the distribution.
B) z-scores are negative for data values below the mean of the distribution.
C) z-scores are positive for data values above the mean of the distribution.
D) z-scores can be positive or negative for data values above the mean of the distribution.