What describes the SAS automatic _ERROR_ variable?

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What describes the SAS automatic _ERROR_ variable?
A . The _ERROR_ variable contains the values ‘TRUE’ or ‘FALSE.’
B. The _ERROR variable maintains a count of the number of data errors.
C. The _ERROR_ variable can be used in expressions or calculations in the DATA step.
D. The ERROR_variable contains the number or the observation that caused the error.

Answer: C