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单项选择题

20. public float getSalary(Employee e) { 
21. assert validEmployee(e); 
22. float sal = lookupSalary(e); 
23. assert (sal>0); 
24. return sal; 
25. } 
26. private int getAge(Employee e) { 
27. assert validEmployee(e); 
28. int age = lookupAge(e); 
29. assert (age>0); 
30. return age; 
31. } 
Which line is a violation of appropriate use of the assertion mechanism?()  

A. line 21
B. line 23
C. line 27
D. line 29

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