A verification activity is an automation studio activity that allows checking the record count or field value of a data extension and sending a notification email if it meets certain criteria. A filter activity is an automation studio activity that allows filtering records from a source data extension into a target data extension based on filter criteria. By using these two activities in an automation, NTO can monitor available coupon codes in their coupon data extension and send a notification email to their email specialist if the available coupon count falls below 500. An import activity is used to import data from an external file or data source into a data extension, which is not relevant for this use case. A data extract activity is used to extract data from a data extension or data view into a file, which is also not relevant for this use case. Reference: https://help.salesforce.com/articleView?id=sf.mc_as_verification_activity.htm&type=5 https://help.salesforce.com/articleView?id=sf.mc_as_filter_activity.htm&type=5