Question: 4. You can show object destruction by a big X at the end of the objects lifeline. Other objects can destroy an object, in which

4. You can show object destruction by a big X at the end of the object’s lifeline.

Other objects can destroy an object, in which case an arrow points from the other object to the X. An X is also useful for indicating that an object is no longer usable and so is ready for garbage collection.

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