The graph shows a distribution of data with a standard deviation of 6.

A graph shows the horizontal axis numbered 60 to x. The vertical axis is unnumbered. The graph shows an upward trend from 60 to 75 then a downward trend from 75 to 90.
Which statement is true about the data point 84?
A. It is within 1 standard deviation of the mean.
B. It is within 2 standard deviations of the mean.
C. It is exactly 3 standard deviations from the mean.
D. It is exactly 4 standard deviations from the mean