Final answer:
The best practice for configuring Assignment Rules of Predictive Intelligence is typically to set both an Assignment group and User based on Category and Subcategory, as it provides a more accurate routing to the appropriate handler.
Step-by-step explanation:
When configuring Assignment Rules of Predictive Intelligence, it is generally considered best practice to make assignment decisions based on a combination of data points that will lead to accurate and efficient routing of tasks. Option 1, which involves setting an Assignment group and User based on Category and Subcategory, leverages multiple levels of categorization to determine the most appropriate group and individual to handle a task. This method allows for specificity and is likely to match the task to the group and user whose expertise aligns with the task's requirements. Option 4, setting an Assignment group based on Category and Subcategory, also uses key categorization to route tasks effectively. While Options 2, 3, and 5 offer other routing methods, they are either less specific or rely on text analysis of the short description, which may not always be reliable if the description is not detailed enough.