Database Question:If an "Identifying" relationship between a 'parent' entity and a ...

If an "Identifying" relationship between a 'parent' entity and a 'child' entity is implemented, which of the following would be true?
   A.   
The primary key of the child entity appears as a foreign key attribute in the parent entity and is not part of the primary key of the parent entity.
   B.   
The primary key of the parent entity appears as a foreign key attribute in the child entity and is not part of the primary key of the child entity.
   C.   
The primary key of the child entity appears as a foreign key attribute in the parent entity and is part of the primary key of the parent entity.
   D.   
The primary key of the parent entity appears as a foreign key attribute in the child entity and is part of the primary key of the child entity.