Professional ethics help teachers to understand their profession as a:

Professional ethics is the codified set of principles and standards of conduct that mark out the members of an occupation as a distinct PROFESSION — with its own duties, accountability, and standing — rather than as an informal role that anyone can perform.

Applied to teaching, these codes establish that the practitioner's identity is that of a TEACHER — a trained, credentialed professional bound by a shared code of conduct — not merely someone who happens, in an ad hoc way, to guide, help, or direct students.

• guide -- in this item's framing, it is the code of ethics itself that functions as a guide, steering conduct; this option names the guiding code, not the profession being guided.

• helper -- names an auxiliary function performed alongside someone else's task; on its own it does not identify the practitioner's specific profession, which is what the question asks.

• director — names a supervisory or administrative post concerned with authority over a system, not the everyday practising identity that classroom-level ethics governs.

Because professional ethics exists to formalize the duties and accountability of a recognized occupation, it affirms the practitioner's identity as a teacher — the correct choice.