Elance Exams Answers PDF file

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Which scenario will not result in NSOperation throwing an exceptions:

When the operation is executing or finished (possibly because it was canceled) and its start method is called again.
When you try to retrieve the result of an NSInvocationOperation object that was canceled.
When you try to add a completion block to an operation that is already executing or finished.
When the operation is not ready to execute but its start method is called.
When the return value from a completion block is nil.
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