32.Consider the following data step:
data WORK.NEW;
set WORK.OLD;
Count+1;
run;
The variable Count is created using a sum statement. Which statement regarding this
variable is true?
A. It is assigned a value 0 when the data step begins execution.
B. It is assigned a value of missing when the data step begins execution.
C. It is assigned a value 0 at compile time.
D. It is assigned a value of missing at compile time.
Answer: C

为什么A不对？在AC之间纠结了好久还是选错了。。。
谢谢大神们!!!