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Which one of the following is true regarding the KEEP statement?

  The KEEP statement is available in both the DATA and the PROC steps.

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  The KEEP statement selects the variables read from the input data set(s).

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  The KEEP statement applies to all data sets created within the same DATA step.

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  The KEEP statement applies only to the first data set created within the same DATA step if more than one data set is created.

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