What are two reasons a data point would be treated as an outlier?

What are two reasons a data point would be treated as an outlier?
A . If the value is greater than mean
B . If the value is greater than median
C . If the value is greater than standard deviation
D . If the value is below the upper end of the bottom quartile by more then 1.5 times the interquartile range
E . If the value is above the lower end of the top quartile by more then 1.5 times the interquartile range

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Answer: DE