Consider a relation R(A,B,C,D,E) with the following dependencies:
```
AB -> C
CD -> E
DE -> B
```
Is AB a candidate key of this relation? If not, is ABD? Explain your answer.
No, AB+ = {A,B,C},a proper subset of {A,B,C,D,E}
Yes, ABD+ = {A,B,C,D,E}
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