Who must sign off on the Class C operator's training log?

The correct answer highlights the necessity for the trainer's employer to sign off on the Class C operator's training log. This requirement ensures that the training provided is recognized and validated by the organization that employs the trainer, which adds credibility to the training process and ensures adherence to industry standards.

The trainer’s employer has the responsibility to verify that the training meets the regulations and competencies required by the state for Class C operators. This sign-off serves as an official acknowledgment that the training was completed satisfactorily and that the operator has been equipped with the necessary knowledge and skills for their role.

In the context of UST operations, having a documented training log that is signed by the trainer's employer is crucial for maintaining compliance with regulatory requirements and assists in any potential audits or inspections by state authorities. It establishes accountability within the training process and supports a structured approach to operator training and certification.