16. Which constraint requires that the binary relationship indicate all combinations that must appear in the ternary relationship?

A. MUST COVER
B. MUST NOT
C. Both of the above.
D. None of the above is correct.

17. Each entity is represented as a(n):

A. tuple.
B. table.
C. attribute.
D. file.

18. For every relationship, how many possible sets of minimum cardinalities are there?

A. Two
B. Three
C. Four
D. Six

20. Which of the following column properties would be used to specify that cells in a column must contain a monetary value that is less than another monetary value in the same row?

A. Null status
B. Data type
C. Default value
D. Data constraints