Câu 35: A00-211: SAS Base Programming for SAS 9

A SAS PRINT procedure output of the WORK. LEVELS data set is listed below:Obs name level -1 Frank 12 Joan 23 Sui 24 Jose 35 Burt 46 Kelly .7 Juan 1The following SAS program is submitted:data work.expertise;set work.levels;if level = . thenexpertise = 'Unknown';else if level = 1 thenexpertise = 'Low';else if level = 2 or 3 thenexpertise = 'Medium';elseexpertise = 'High';run;Which of the following values does the variable EXPERTISE contain?

1. A. Low, Medium, and High only
2. B. Low, Medium, and Unknown only — đáp án hiện tại
3. C. Low, Medium, High, and Unknown only
4. D. Low, Medium, High, Unknown, and ' ' (missing character value)