The diagram fragment shows an instance specification for anEmployee. The different prefixes before each attribute indicate the visibility of that attribute:

+Public: Visible to everyone.

-Private: Visible only within the defining class.

#Protected: Visible to subclasses and package.

~Package: Visible to all classes within the same package.

Given these visibility indicators, the attribute with the private visibility is-salary: Real. This means that thesalaryattribute is the one that is hidden outside of thecurrent:Employeeclassifier and cannot be accessed by entities that do not belong to theEmployeeclass.

Therefore, the correct answer is:

C. salary