Which action can be performed using the Assign activity?

The Assign activity in automation processes is specifically designed to set or change the value of a variable. This means that when you use the Assign activity, you are defining an expression that evaluates to a value, which is then stored in a specified variable. This action is essential for updating values throughout a workflow, essentially allowing dynamic manipulation of data as automation executes.

Using the Assign activity is a straightforward way to manage the contents of variables by assigning new values based on either previous values, user inputs, or calculations performed during the execution of the automation. This integral function helps maintain the flow of data within the automation system.

The other choices involve actions that require different specific activities or methods within automation development. While calling external functions may require specialized activities designed for method invocation, looping through a list typically relies on loop structures rather than simple assignments. Displaying messages often utilizes different activities aimed at user interaction or logging outputs. Thus, using the Assign activity is specifically suited for the purpose of setting variable values.