Final answer:
Agents must disclose their representation of an actor to relevant parties, such as casting directors, to ensure transparency in the professional relationship and casting process.
Step-by-step explanation:
In the context of agency representation, when an agent is representing an individual, such as an actor, they have a duty to disclose this relationship to all relevant parties involved. The principle of disclosure requires that agents inform the casting director that they are acting on behalf of the actor and looking to secure opportunities. The casting director is typically the one who selects actors for roles, so when an agent pitches the actor to this professional, they must make the relationship clear to avoid any conflicts of interest or misunderstandings. In the film and theater industry, transparency is key to maintaining professional relationships and ensuring all parties are aware of the existing representation.