Which method is available for administering examinations for CNG?

The option indicating online testing or proctoring service is the appropriate choice because it reflects the modern and flexible educational practices that many certification and training programs have adopted. This method allows candidates to take exams in a more convenient environment, which can improve accessibility for various learners, especially those who may find it challenging to attend in-person sessions due to distance or time constraints.

Online testing often incorporates secure proctoring services to maintain the integrity of the examination process, ensuring that the testing is conducted fairly just as it would be in a traditional setting. This includes measures such as identity verification and monitoring during the test.

Other methods listed may not provide the same level of accessibility or security needed for a comprehensive examination process. In-person testing can limit reach, particularly for those in remote areas, while mail-in testing could raise concerns about security and consistency in administering the exam. Telephonic testing lacks the visual component that is often critical for certain examinations, especially in technical fields like CNG delivery.