Which statement describes a characteristic of the SAS automatic variable _ERROR_?
A. The _ERROR_ variable maintains a count of the number of data errors in a DATA step.
B. The _ERROR_ variable is added to the program data vector and becomes part of the data set being created.
C. The _ERROR_ variable can be used in expressions in the DATA step.
D. The _ERROR_ variable contains the number of the observation that caused the data error.
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_ERROR_ counts number of errors.