sas base 123题 中的第9题，答案选C，
这里有个疑问，infile 'file-specification' option dlm = ',';
option 写在这个位置合适吗？感觉不对呢？

原题如下：

QUESTION 9
A raw data record is listed below:
----|----10---|----20---|----30
son,Travis,
The following output is desired:
relation firstname
son Travis
Which one of the following SAS programs reads the data correctly?
A. data family / dlm = ',';
infile 'file-specification';
input relation $ firstname $;
run;
B. option dlm = ',';
data family;
infile 'file-specification';
input relation $ firstname $;
run;
C. data family;
infile 'file-specification' option dlm = ',';
input relation $ firstname $;
run;
D. data family;
infile 'file-specification';
input relation $ firstname $ / dlm = ',';
run;
Answer: C