When applying the M-N relationship rule for converting an ERD into a relational table design, which of the following statements is true?

A. Each M-N relationship becomes a separate table.
B. The primary key of the table is the primary key of the entity type participating in the M-N relationship which has the most attributes.
C. The primary key of the table is a combined key consisting of the primary keys of the entity types participating in the M-N relationship.
D. A and C.