The dataset orion.counsellor contains the following variables: Counsel_ID, DateOfBirth, Yrs_Exp, Salary. Given the following code: Data counsel_new; Set orion.counsellor; Study = Yrs_Exp + 3; Bonus = Salary * 1.05; Run; Which of the following variables will be re-initialized at the start of each iteration of DATA Step? (a) Yrs_Exp (b) Counsel_ID (c) Bonus (d) DateOfBirth
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