11. Specifying a key ensures that no two objects belonging to a class have the same value for the key attribute(s).
A. True
B. False
12. If you know all the possible values that an attribute can have, you can enumerate those values in ODL.
A. True
B. False
13. You may specify an object identifier with only one unique tag name.
A. True
B. False
14. In ODL, you specify an operation using parentheses after its name.
A. True
B. False
15. An ordered collection of elements of the same type are called sets.
A. True
B. False