Representing a Unary Many-To-Many Relationship in a Relational Database ____

Representing a unary many-to-many relationship in a relational database ____.

A) requires the creation of an additional relation
B) requires adding a new column, the domain of values of which is the same as the relation's primary key
C) requires adding a new column, the domain of values of which is the same as the primary key of another relation in the database
D) requires modifying the primary key of the relation
E) requires replacing the primary key of the relation with an alternate key