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Choose the wrong statement regarding Object oriented design

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Choose the wrong statement regarding Object oriented design:

A. A signal is generated in case of asynchronous events only.

B. a powertype is a metaclass whose instances are super classes of a given class

C. A table in database can be considered as artifact.

D. In UML, a subsystem is considered as a type of package

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I think the answer is option (A) signal is generated in case of asynchronous events only,because the option is not related to oops concept.
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