![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
When using the relational model to represent two tables, one must ________.
A.
add a foreign key to one of the tables
B.
have more than two primary keys in the model
C.
establish only N:M relationships between the tables
D.
use metadata instead of foreign keys
E.
minimize the number of columns in the second table