A database trigger is an alternative for?

I had the following quiz question and could not answer it myself because of a little confusion.

Please answer this and tell me why?


A database trigger is an alternative for?


A. Stored procedure

B. Primary key for implementing referential integrity

C. Foreign key for implementing referential integrity

D. All of the above

I don't expect the writer of the question meant it this way, but words mean things and the question specifies a "database trigger", therefore there is no correct answer.


A DATABASE trigger is created on the database and fires whenever any database user initiates the triggering event. (PL/SQL Language Reference - DATABASE Triggers)

Unlike Row and Statement triggers, Database triggers fire for things like
AFTER STARTUP ON DATABASE, AFTER SERVERERROR ON DATABASE and AFTER LOGON ON DATABASE.

StackExchange Database Administrators Q#35604, answer score: 12