The following SAS program is submitted:
data WORK.TEMP;
length A B 3 X;
infile RAWDATA;
input A B X;
run;

What is the length of variable A?
A. 3
B. 8
C. WORK.TEMP is not created - X has an invalid length.
D. Unknown.

X 的length应该没有被assign然后导致work.temp not created, 答案为什么是A