A table named STATES was created as follows:

What will happen?
- A An error will be returned and the operation will fail.
- B A warning will be returned and the unique index INDX1 will become the index for the primary key.
- C The primary key will be successfully added and the unique index INDX1 will be dropped and recreated as the primary key index.
- D The primary key will be successfully added, the unique index INDX1 will be dropped, and a new index will be created for the primary key.