Which statement is true regarding the effect of the command?

View the Exhibit and examine the structure of the EMP table. You executed the following
command to add a primary key to the EMP table: ALTER TABLE emp ADD CONSTRAINT
emp_id_pk PRIMARY KEY (emp_id) USING INDEX emp_id_idx; Which statement is true
regarding the effect of the command?

A.
The statement produces an error because the USING clause is permitted only in the
CREATE TABLE command.

B.
The PRIMARY KEY would be created in a disabled state because it is using an existing
index.

C.
The PRIMARY KEY is created along with a new index.

D.
The PRIMARY KEY is created and it would use an existing unique index.

Explanation: