When Assigning Foreign Keys in a 1:1 Association

Multiple Choice

When assigning foreign keys in a 1:1 association:

A) The primary key of each table should be embedded as a foreign key in the related table
B) The primary key on the (0,1) side of the relation should be embedded as the foreign key on the (1,1) side.
C) The primary key on the (1,1) side of the relation should be embedded as the foreign key on the (0,1) side.
D) None of the above is true