Which legal actors are ethically bound to assure that a defendant is competent to stand trial?

The answer to this question is The defense attorney, the judge, and the prosecuting attorney
Defense attorney has the role to handle the case and give the defendant the best possible outcome. The judge play the role to treat both defendant and accuser in friendly manner. The Prosecuting attorney are required not to approach the defendant outside the court.

D. a conflict between her competing identities.