Answer: Option B
Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.
The data model produced from the reverse engineering process is a true logical model.
Changing cardinalities in a database is:
A. a common database design task.
B. a rare database design task, but does occur.
C. a database design task that never occurs.
D. is impossible to do, so a new database must be constructed and the data moved into it.
The EXISTS keyword will be true if:
A. any row in the subquery meets the condition only.
B. all rows in the subquery fail the condition only.
C. both of these two conditions are met.
D. neither of these two conditions is met.