30.You're attempting to read a raw data file and you see the following messages
displayed in the SAS Log:
NOTE: Invalid data for Salary in line 4 15-23.
RULE: ----+----1----+----2----+----3----+----4----+----5--
4 120104 F 46#30 11MAY1954 33
Employee_Id=120104 employee_gender=F Salary=. birth_date=-2061 _ERROR_=1
_N_=4
NOTE: 20 records were read from the infile 'c:\employees.dat'.
The minimum record length was 33.
The maximum record length was 33.
NOTE: The data set WORK.EMPLOYEES has 20 observations and 4 variables.
What does it mean?
A. A compiler error, triggered by an invalid character for the variable Salary.
B. An execution error, triggered by an invalid character for the variable Salary.
C. The 1st of potentially many errors, this one occurring on the 4th observation.
D. An error on the INPUT statement specification for reading the variable
Salary.
Answer: B

请问这题为什么是B？A为什么不对？execution error是什么？看解释也没有明白，求大神们帮帮我
谢谢！！！