Question: The primary key for M:N ( Many - to - Many ) relationship tables does not exist. Many - to - many relationship tables only

The primary key for M:N (Many-to-Many) relationship tables
does not exist. Many-to-many relationship tables only use foreign keys.
is a single attribute.
always consists of two attributes.
is the primary key of the most important entity linked to that relationship.
The primary key for M:N (Many-to-Many) relationship tables does not exist.

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