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Discuss the differences between the candidate keys and the primary key of a relation. Explain what is meant by a foreign key. How do foreign keys of relations relate to candidate keys? Give examples to illustrate your answer.

What will be an ideal response?

Which of the following is true for a correct producer/consumer relationship with one producer, one consumer, and a 5-cell buffer?

a. The producer can produce when all cells are full. b. The consumer can consume when all cells are full. c. The consumer can consume when all cells are empty. d. None of the above.