Answer:
The correct answer is letter "D": All of these are correct.
Explanation:
The Free Rider Problem refers to someone being able to gap for less or even for free what others pay more for. The problem arises when individuals are unwilling to pay their fair share for something that most others pay for. The problem is more often while talking about public goods. To avoid this issue, some sort of special must be given to consumers such as discounts, promotions for subscriptions or special information online.