Which Internet Explorer security zone includes all Internet Web sites that are not specifically assigned to another zone?

Internet is the correct answer for the above question.

Explanation:

The Internet Explorer define some security zone (which includes the Restricted sites, internet, Trusted sites, and Local intranet) which is used to block the unwanted sites which can be opened by some other websites. When any user use any website, sometimes that websites open different websites. This security zone gives the features to secure the user from this event. There are four-zone which are described in the first line, in which the internet zone is used to take all the websites which are not defined for the other security zone. It means that when any user does not decide the security zone for any websites then by default it comes in the internet zone. This is also asked by the question, Hence "internet" is the correct answer.