Which of the following meets the qualifications under NFPA 72 as an installer?

The qualifications under NFPA 72 for an installer generally require adherence to specific standards that ensure proper installation, maintenance, and functionality of fire alarm systems. Being State Licensed is crucial because it signifies that the installer has met the necessary criteria set by state regulations, including passing tests and fulfilling educational requirements. This means the installer is recognized by the state as qualified to perform installations, which is a fundamental requirement in many jurisdictions to ensure safety and compliance with the law.

In contrast, while options like being an apprenticed or certified technician may indicate some level of training or experience, they do not necessarily guarantee that the installer has met all state-specific licensing requirements. Moreover, being self-taught lacks formal recognition and oversight, which is vital to ensure the installer understands all safety standards and codes laid out by NFPA 72. Therefore, state licensing is the most definitive qualification listed in the options, providing assurance of competence and legal compliance in fire alarm installation.