Which statement is true about the DROP statement during the compilation phase of the DATA step?

Which statement is true about the DROP statement during the compilation phase of the DATA step?
A . The DROP statement flags the variables in the Program Data Vector to be dropped at output.
B. The DROP statement determines the order of the variables in the Program Data Vector
C. Variables on the DROP statement are removed from the input data set.
D. Variables on the DROP statement are not created in the Program Data Vector

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Answer: C