To inform NTO's marketing manager if more than 1,000 records are ever imported through this automation, and prevent the sendable data extension from being updated that day, the consultant should place a Verification Activity between the import and SQL Query activity. A Verification Activity is an activity that allows marketers to verify if certain conditions are met before proceeding with the next activity in an automation. For example, a Verification Activity can check if the number of records in a data extension is above or below a specified threshold, and send an email notification or stop the automation based on the result.References:https://help.salesforce.com/s/articleView?id=sf.mc_as_verification_activity.htm&type=5