Which of the following is NOT an option within the Error Alert tab in Data Validation?

In the context of Excel's Data Validation feature, the Error Alert tab includes options that allow users to manage how errors are handled when invalid data is entered.

The Style option lets you choose the type of error alert that will be displayed to the user—whether it is a Stop, Warning, or Information message. The Error message option allows you to specify the text that will appear in the alert dialog when an invalid entry is attempted, helping to guide users on how to correct their input. Additionally, while the Input Message is part of the Input Message tab, it is relevant here because it provides context or instructions prior to data entry but does not belong to the Error Alert tab itself.

On the other hand, the Default Value is not a feature associated with the Error Alert tab in Data Validation. This concept typically relates to preset values that might appear in a cell or control under certain conditions, rather than being tied to error handling in data validation settings. Thus, Default Value is accurately identified as the option that does not belong within the Error Alert tab.