Which template allows you to create a pool of users that may be tasked to work a step in the approval process?

The correct answer is a User-Defined List, as it allows you to create a pool of users who can be assigned to a step in the approval process. This list is customizable, enabling you to select specific users based on different criteria or roles relevant to the task at hand. By utilizing a User-Defined List, you can enhance flexibility in the approval workflow, ensuring that the right individuals are available to handle specific approvals as needed.

In contrast, a Standard Approval Template is designed to provide a fixed structure for the approval process, rather than allowing for the customization of user assignments. A Custom Workflow, while also capable of defining approval processes, generally focuses more on the specific steps and conditions rather than on the user pool itself. An Approval Group might seem relevant, but it typically refers to a predefined collection of users for approvals rather than a flexible, easily customizable list that allows for broader user definition and selection.

Therefore, the emphasis on customization and selecting users for an approval step highlights why a User-Defined List is the appropriate choice.