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Question: Match this design pattern: A class of which only a single instance can exist
Answer1: Singleton
Answer2: Adapter
Answer3: Decorator
Answer4: Strategy
Answer5: State
Answer: Singleton

Explaination: Ensure a class has only one instance and provide a global point of access to it
Link: External Explaination

Correctly answered: 4989
Incorrectly answered: 692
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