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. a link table must be created to accept the foreign keys of both tables.

e. none of the above is true.