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Which statement is true regarding the SET statement?
Correct Answer: A
The correct answer is A. The SET statement in SAS is used within a DATA step to specify which existing SAS dataset is to be read. This statement is used to read in data from an existing SAS dataset to be processed in the current DATA step. The SET statement does not specify an output data set; that is determined by the name specified in the DATA statement. Options B, C, and D are incorrect because: * B and C are incorrect as the SET statement is not used in the PROC SORT step at all. * D is incorrect because the SET statement specifies the input dataset, not the output dataset, in the DATA step. References: * SAS 9.4 Language Reference: Concepts, "DATA Step Processing" * SAS documentation on the SET statement.