When Representing a 1:1 Relationship in a Relational Database Design,________

Multiple Choice

When representing a 1:1 relationship in a relational database design,________.

A) the key of each table must be placed as foreign keys into the other
B) the key of either table may be placed as a foreign key into the other
C) the key of both tables must be the same
D) the intersection table gets the key from both relations
E) B and C