Which of the following is correct about Foreign Key $($FK$)$ in RDBMS table design? FK is not the primary key of one table, but is tied to a primary key of another table. FK is not the primary key of one table, and is not tied to the primary key of another table. FK is the primary key of one table, and is not tied to the primary key of another table. FK is the primary key of one table, and is tied to the primary key of another table.