---

Given the following data set:




Which SAS program produced this output?

proc sort data=one(where=(age>50)) out=two;
by subjid;
run;

proc sort data=one out=two;
if age>50;
by subjid;
run;

proc sort data=one(if=(age>50)) out=two;
by subjid;
run;

proc sort data=one out=two;
where=(age>50);
by subjid;
run;