Which agency developed the standards for telecommunicator training?

The correct answer is APCO International because this organization is recognized for developing the standards and guidelines for public safety telecommunicator training. APCO International, or the Association of Public-Safety Communications Officials, has a long history of supporting the telecommunicator profession by establishing comprehensive training programs and certifications that promote effective communication and operational practices in emergency services.

The other agencies listed have important roles in public safety, but they focus on different aspects. For instance, the National Emergency Number Association primarily addresses issues related to the emergency number system, while the Federal Communications Commission regulates communications within the United States but does not specifically develop training standards for telecommunicators. The International Association of Chiefs of Police focuses on law enforcement leadership and policy, rather than directly on training for telecommunication professionals. Therefore, APCO International is the authoritative body responsible for establishing the training standards for telecommunicators.