When defining a data store in ODI metadata, is it possible to add a primary key even if it does not physically exist on the related database catalog?

When defining a data store in ODI metadata, is it possible to add a primary key even if it
does not physically exist on the related database catalog?

A.
Yes, by adding constraints to the datastore diagram.

B.
Yes,by adding constraints on the datastore.

C.
No, you can only reverse-engineer existing constraints.

D.
No, you can only flag non-null conditions to be checked.