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The rule(s) for creating a Singleton class is to ensure that it has the following: A . A static field containing its only instance. B

The rule(s) for creating a Singleton class is to ensure that it has the following: A . A static field containing its only instance. B . A private constructor; A static field containing its only instance. C . A private constructor;A static field containing its only instance; A static factory method for obtaining the instance.

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