Final answer:
Participants can mail in their answer sheets if they are unable to submit the completed exam before they leave the class.
Step-by-step explanation:
Fact. Participants can mail in their answer sheets if they are unable to submit the completed exam before they leave the class. This allows for flexibility and ensures that students who may face time constraints are still able to complete and submit their exams. However, it's important to check the specific instructions and guidelines provided by the testing organization to ensure that mailing in the answer sheets is a valid option.