A00-202 practice - PrepKeys

Q3 Single choice

In which one of the following SAS programs is the SAS data set index named CHAR1 always used?

A
data three;
set one;
set two key = char1;
run;
B
data three;
set one;
if char1 in ('new york' 'los angeles');
run;
C
data three;
set one;
where char1 in ('new york' 'los angeles');
run;
D
proc sql;
create table three as select * from one, two
where one.char1 > two.char1;
quit;