For which of the following is NOT true of complex joins?

For which of the following is NOT true of complex joins?

A.
They are joins over non-foreign key and primary key columns

B.
If defined in the physicallayer, you can specify expressions and the specific columns on which the join is created

C.
You can create complex joins in joins Manager > Action > New > Complex Join

D.
You have to specify expressions and the specific columns when creating complex joins in the business model and mapping layer