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For a car table, the licence plate plus the state can serve as a:

ACombined key
BContracted key
CCandidate key
DConstant key
Answer & Solution
Correct answer: C. Candidate key
1. No two cars share the same plate within a state. 2. Together the two attributes identify each row uniquely. 3. So they form a candidate key. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._
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