Final answer:
Both the person with a Supervised Learning Permit (SLP) or a Provisional Driving License (PDL) and their passengers must wear seat belts while driving to ensure safety and comply with laws designed to reduce accidents and injuries.
Step-by-step explanation:
When a person with a Supervised Learning Permit (SLP) or a Provisional Driving License (PDL) is driving, both individuals in the vehicle must wear seat belts. This requirement is in place to ensure the safety of both the novice driver and the experienced supervising driver (SLP) or the additional passengers with a driver holding a PDL. Governments enact laws mandating seat belt usage to protect the public from the dangers of individuals driving without seat belts, which can result in accidents with serious, life-altering injuries that could subsequently become a burden on society. Therefore, the correct answer to the question is: 1) Both the SLP and PDL person.