Select the correct answer.

How is Usenet traffic different from regular Internet traffic?
OA.
Usenet traffic requires Usenet servers.
OB.
Usenet traffic is restricted within the United States.
OC. Every message sent to the newsgroup is moderated.
O D.
A subscription plan is required to receive Usenet traffic.

OA. Usenet traffic requires Usenet servers.

The correct answer is:

A. Usenet traffic requires Usenet servers.

To select the correct answer, let's analyze each option and eliminate the incorrect ones based on the difference between Usenet traffic and regular Internet traffic:

OA. Usenet traffic requires Usenet servers.
This option is correct because Usenet traffic is specifically transmitted through Usenet servers. These servers are responsible for distributing and archiving messages across the Usenet network.

OB. Usenet traffic is restricted within the United States.
This option is incorrect because Usenet traffic is not restricted to the United States. Usenet is a global network, and messages can be accessed and shared by users worldwide.

OC. Every message sent to the newsgroup is moderated.
This option is incorrect because not every message sent to a newsgroup is necessarily moderated. While some newsgroups may have moderators who review and control the content being posted, it is not a defining characteristic of Usenet traffic as a whole.

O D. A subscription plan is required to receive Usenet traffic.
This option is incorrect because Usenet traffic does not necessarily require a subscription plan. While some Usenet servers may require a paid subscription for access, there are also free Usenet servers available.

Thus, the correct answer is OA. Usenet traffic requires Usenet servers.