Exam UiARD topic 9 question 28 discussion

A developer created a project that contains a flowchart. The developer received a change request from the business as follows:

1. If the Invoice Number contains special characters, the robot must remove them and then continue the process.
2. If the Invoice Number contains only digits, do not change anything, keep the existing logic.

In order to add the new requirement, which activity should the developer use in the flowchart based on UiPath best practices?