Final answer:
The correct answer is that a permit holder under the age of 21 must have c. 2 red decals on the front and back license plates, which helps in identifying them as new or young drivers.
Step-by-step explanation:
The holder of a permit who is under the age of 21 must have 2 red decals on the front and back license plates. This requirement is often part of graduated driver licensing laws that aim to increase safety for new drivers. For young or beginner drivers, these decals are intended to help police and other drivers to identify them as less experienced drivers, which can also alert others to be more cautious and understanding on the road. These laws and policies vary by state and jurisdiction, so it's important to check the specific requirements where you live or where the permit is issued.
The subject of this question is Business and it is at a High School level. The question is asking about the requirements for a holder of a permit who is under the age of 21. In this case, the correct answer is a. 1 red decal on the front and rear license plate. This means that the permit holder should have one red decal on both the front and rear license plates of their vehicle.