求大佬们解答以下sas base70题的第30题

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零基础开始学习sas 不懂就问啦~~~感谢大家的解答！！！！
题目如下：

You're attempting to read a raw data file and you see thefollowing 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     11MAY195433

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 was33.

       The maximum record length was33.

NOTE: The data set WORK.EMPLOYEES has 20 observations and 4variables.

What does it mean?

A. A compiler error, triggered by an invalid character for thevariable Salary.

B. An execution error, triggered by aninvalid character for the variable Salary.

C. The 1st of potentially many errors, this one occurring on the4th observation.

D. An error on the INPUT statement specification for reading thevariable Salary.

答案：B

最好能逐句逐句的解答 因为我的理解能力比较差哈~~~非常感谢大家~~~~~~

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关键词：SAS base Base observations observation Character

可以参考一下这个

披颜辟衡闱2 发表于 2018-9-25 18:00
可以参考一下这个

灰常感谢~~~