Choose the view used to display and edit source information created by a third party web design.

The correct choice is to use Code view when working with source information created by a third-party web design. Code view allows users to see and edit the HTML, CSS, and JavaScript code directly. This is particularly important when interacting with files from third-party sources because it enables you to make precise changes and adjustments to the underlying code without the abstraction of a visual interface.

In Code view, developers have full control over the text-based code, which is essential for troubleshooting, optimizing performance, and ensuring that the design adheres to web standards. This view is particularly useful for those who are comfortable with coding and want to delve into the specifics of the implementation, as it allows for a deeper understanding and manipulation of the website's structure and functionality.

While other viewing options like Split view allow for a combination of visual design and code, Code view focuses solely on the code, making it the optimal choice for direct editing of third-party designs.