Answers
Candidate key uniquely identifies a row in a table. It can have one attribute or composite (multiple attributes).
ANSWER - 6) None of the above
AE - Row 2 and 5 have same values for A and E, they can't uniquely identify every row.
BC - Row 1 and 2 have same values.
BD - Row 1 and 2 have same values.
CD - Row 1 and 2 have same values, Row 3 and 4 have same values.
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