Which statement about NOT ENFORCED unique constraints is TRUE?
A.
NOT ENFORCED unique constraints can not be defined on primary key columns
B.
The query optimizer will consider a NOT ENFORCED unique constraint when selecting an optimal data
access plan
C.
When attempting to insert data that does not conform to a NOT ENFORCED unique constraint, a warning
will be returned
D.
Storage requirements for a NOT ENFORCED unique constraint are no different than the storage
requirements for a similar unique index