Elance Exams Answers PDF file

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In a Use Case, actor Librarian unconditionally performs action 'Reshelf' on an instance of Book serially n times. Which one is true?

A book cannot be reshelved after it has already been reshelved
This is fine as long as n has some upper bound
A Use Case cannot have such a loop
There should be a check for 'Not on Shelf'
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