Question: The usual way for relational database designers to enforce referential ntegrity by: Select one: 1. Not null in the CREATE TABLE COMMAND 2. Foreign Key

The usual way for relational database designers to enforce referential ntegrity by: Select one: 1. Not null in the CREATE TABLE COMMAND 2. Foreign Key in the CREATE TABLE COMMAND 3. Check Integrity in the CREATE TABLE COMMAND 4. Primary Key in the CREATE TABLE COMMAND

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