What happens if you change the primary key of a functional location?

[answerhappygod]

What happens if you change the primary key of a functional location?

A. The user must decide whether the functional location is assigned to a new superior functional location.
B. The user must define a new labelling system for the new primary key.
C. Changing the superior functional location via alternative labeling is not possible.
D. The functional location is immediately assigned to a new superior functional location when the new label is entered.