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Multiple choices 19/50
Answer (Choose 1 answer)
Which of the following is disadvantage of Observer pattern?
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A. We can reuse subject and observer classes independently of each other.
B. Subject only knows that observer implement Observer interface. Nothing more.
C. Memory leaks caused by Lapsed listener problem because of explicit register and unregistering of observers.
D. There is no need to modify Subject to add or remove observers.
