The correct answers are B and D because CCPS emphasizes that training effectiveness must be verified through demonstrated understanding and competency , not simply attendance or acknowledgment.

Option B is correct because a written quiz or test is a structured method to assess whether the operator has understood key concepts, procedures, and safety requirements. Properly designed tests can validate knowledge retention and comprehension.

Option D is also correct because trainer verification of demonstrated understanding (such as practical demonstrations, simulations, or observed task performance) provides strong evidence that the operator can apply the training in real work situations. This aligns with CCPS expectations for performance-based competency assurance .

Option A is not sufficient because a signed form only confirms that training was completed, not that it was understood. Option C is also inadequate, as attendance does not demonstrate comprehension or ability to perform tasks safely.

CCPS stresses that organizations must ensure personnel are not just trained, but competent to perform safely , which requires verification through testing, observation, and demonstrated performance rather than passive confirmation methods.