The PDV is not created at a specific point like the beginning of the DATA step or the first SET or OUTPUT statement. It is dynamically built as needed. When the DATA step begins, the PDV doesnt exist. It is created as the DATA step encounters variables from the input dataset (using a SET or other input statement). The PDVs structure changes based on the variables being read and new variables being defined.

In PROC PRINT, the VAR statement is used to control the order of the variables displayed in the report. You can list the variables in the order you want them to appear. The KEEP statement can control which variables appear, but not their order. DROP and SELECT are not valid statements within PROC PRINT for controlling the order of variables.
References
* SAS documentation for PROC PRINT.

The PROC MEANS report shown in the image displays statistics for a single variable Age with no decimal places. The correct SAS code to generate such a report is option D, which uses the PROC MEANS procedure with the maxdec=0 option to control the number of decimal places displayed (in this case, zero) and specifies Age as the analysis variable using the var statement.
The PROC MEANS procedure computes descriptive statistics for numeric variables. The maxdec=0 option is used here to remove decimal places from the report output, which matches the output shown where the mean, standard deviation, minimum, and maximum are all integers.
The other options are incorrect for the following reasons:
* A uses the class statement, which is not appropriate here because Age is not a classification variable but an analysis variable.
* B uses the group statement, which is not a valid statement in the PROC MEANS procedure.
* C uses the by statement, which requires the data to be sorted by the BY variable and does not fit the output provided since it would produce separate statistics for each value of Age.
References:
* SAS 9.4 documentation for the PROC MEANS statement: SAS Help Center: PROC MEANS

The correct answer is option C. The MAXDEC= option within PROC MEANS controls the number of decimal places displayed for statistics. By specifying MAXDEC=(age=2, salary=2), we set the decimal places to two for variables 'age' and 'salary'. This will round the mean and standard deviation values to two decimal places. The MIN function in the output statement will truncate the minimum values to integers, effectively removing decimal places Options A and B apply the MAXDEC option to all variables, which doesn't meet the requirement of displaying integer minimum values- Option D uses the wrong format in the output statement for minimum values. Option E tries to use FORMAT to control the output format but does not specify the format for the minimum values. Option C is the only option that correctly implements both the MAXDEC= option and the MIN function to achieve the desired formatting.

Options A and D are correct. Both options use the WHERE statement (either explicitly or implicitly) to filter rows in the source dataset based on the product value. Option A uses the IN operator to select rows where 'product' is either 'laptop' or 'tablet. Option D uses an IF statement with a THEN OUTPUT statement to achieve the same filtering behavior. Option B is incorrect because it uses an IF statement without an OUTPUT statement, which means it will not create a new dataset but will simply process the data without creating a new output dataset. Option C is also incorrect because it uses an OUTPUT statement without any condition, which means it will create a new dataset with all rows from the source dataset, not just those where the product is 'laptop' or 'tablet'. Option E is incorrect because it uses an OUTPUT statement with an incorrect target dataset name. The OUTPUT statement in a DATA step automatically creates a new dataset with the name specified in the DATA statement. Therefore, the correct code snippets are.