Which of the following describes a key responsibility of the employer regarding NDT personnel?

A key responsibility of the employer regarding NDT (Non-Destructive Testing) personnel is to establish and maintain written practices. This responsibility is crucial as it ensures that there are standardized procedures in place that comply with industry standards and regulations. By having these written practices, the employer provides clear guidelines on how NDT processes should be conducted, which helps to ensure quality and consistency in testing operations.

Written practices serve as foundational documents that outline methods, techniques, responsibilities, and qualifications required for personnel. This is essential for training new employees and for maintaining the certification of current personnel. Such practices not only help in complying with legal and regulatory requirements but also enhance safety and reliability in testing.

While providing ongoing training and certification is also an important aspect of an employer's responsibilities, the establishment of written practices is fundamental as it lays the groundwork for how all other functions, including training, will be executed. Evaluating test results independently or directing all Level III testing procedures may also be relevant tasks, but they do not encapsulate the broad responsibility of establishing and maintaining a framework for NDT practices.