How is a custom workspace defined in Adobe applications?

A custom workspace in Adobe applications is defined as one that has been created by a user and saved with a unique name. This allows the user to tailor the layout of tools, panels, and other interface elements to suit their specific workflow and needs. By creating a custom workspace, users can enhance their productivity as they can arrange the user interface in a way that is most convenient and efficient for their particular tasks.

Although some Adobe applications do come with preloaded workspaces, these are not considered custom because they are preset configurations designed by Adobe. A default layout of tools and panels refers to the initial setup provided by the application, which does not include any personalized adjustments made by the user. Collaborative workspaces, while useful, typically refer to setups that multiple users can access and modify together, rather than individualized settings that one user has customized. Therefore, option B accurately captures the essence of what a custom workspace is within Adobe applications.