The primary key of the relation added to accomplish the many$-$to$-$many relationship

$q,$

does not involve the primary keys of either of the two relations involved in the many$-$tomany relationship

is the combination of the primary keys of the two relations involved in the many$-$to$-$many relationship plus possible additional attributes

is the primary key of one of the two relations involved in the many$-$to$-$many relationship

must contain at least four attributes

must contain at least three attributes