Multiple choice technology programming languages

What are the 2 duplicates removal options for proc sort?

  1. NODUPKEY and NODUPRECS

  2. NODUPS and NODUPLICATES

  3. NODUPKEYS and NODUPREC

  4. DELETEDUPS and DELETERECS

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A Correct answer
Explanation

PROC SORT offers two duplicate removal options: NODUPKEY removes observations with duplicate BY variable values, while NODUPRECS removes completely identical observations (all variables match).