Which action can a subflow perform in ServiceNow?

A subflow in ServiceNow Flow Designer is designed to encapsulate specific sets of actions that can be reused across multiple flows. One of the core functionalities of a subflow is to perform data transformations on an incoming dataset. This allows for the manipulation and formatting of data as needed before passing it to subsequent actions or flows. Subflows can take input parameters and return output, making them particularly powerful for changing data structures or values in a flexible and scalable way.

When considering the other options, executing a scheduled job on a specific date is more aligned with specific scheduling configurations or job records rather than the capabilities of a subflow. Likewise, sending notifications to external email systems typically occurs through notifications within the platform rather than being a function of a subflow. While subflows can utilize certain actions that may allow sending notifications, they do not inherently manage email systems externally.

Thus, the action of performing data transformations is the most aligned with the intended purpose and capability of a subflow in ServiceNow, reinforcing the understanding of how subflows are implemented within Flow Designer.