What does it mean when message m is ignored in a combined fragment?

Posted by: Pdfprep Category: OMG-OCUP2-INT200 Tags: , ,

What does it mean when message m is ignored in a combined fragment?
A . Nothing happens within the fragment until m appears.
B . Message m appears only in illegal traces of the fragment.
C . If m happens, the system should abort.
D . One or more m messages may appear at any point within the fragment.

Answer: D

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