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Specialization Lattice stands for 

  1. An entity type can participate as a subclass in only one specialization.
  2. An entity type can participate as a subclass in more than one specialization. 
  3. An entity type that can participate in one specialization.
  4. An entity type that can participate in one generalization. 
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(B) An entity type can participate as a subclass in more than one specialization

Say student specialized as i) current student ii) Ex Student

Again Student worked as i) a teacher ii) in a company
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