Assertion. Every document linked to the web has a URL.

Reason. A location on a net server has a unique address called URL (Uniform Resource Locator).

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Both A and R are true and R is the correct explanation of A.

Explanation
A URL (Uniform Resource Locator) is a unique address used to locate resources (such as documents, images, videos, etc.) on the web server. When a document is linked to the web, it is associated with a specific URL that allows users and web browsers to access and retrieve that document from its location on the server.