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QUESTION 1 1 1 4 10 For the following data (blank spaces are nulls), what would be one of the valid primary keys for the

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QUESTION 1 1 1 4 10 For the following data (blank spaces are nulls), what would be one of the valid primary keys for the table A B D open 10 cat closed 10 dog open 10 dog 5 closed open 20 dog a. Cand D as one key Ob.B c. A and B as one key O d. A 8

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