Final answer:
A 'data quota' is the correct term for the limit set by ISPs on the amount of traffic a subscriber can use. The concept is tied to net neutrality debates, focusing on fair internet access and avoiding a divided internet between those who can and cannot afford higher fees for faster service.
Step-by-step explanation:
The term that refers to a limit imposed by an Internet Service Provider (ISP) on the total amount of traffic that a given subscriber can consume, usually per each billing period, is known as a data quota. Option d. Data quota correctly defines this limit. Every subscriber's data usage is measured against this quota, and exceeding it could lead to additional charges, reduced speeds, or other restrictions.
In the context of net neutrality, ISPs are currently expected to treat all internet traffic equally without unfairly prioritizing certain content or services over others. However, debates continue on how to balance the fair regulation of broadband providers, ensuring they operate profitably while maintaining an open and neutral internet. This ensures that all content providers, regardless of their economic status, have the same opportunity to reach consumers, fostering an environment of freedom and equality on the internet.