DreamHouse Realty wants to track how many lifts are being installed into Customer garages.

The correct answer is C. Flow.

This requirement needs automation that can do multiple things: update the To Be Installed checkbox when a Lift is sold, then notify an external system the next day using an outbound message. Salesforce states that Flow Builder is the optimal tool for triggered automation because it combines workflow and process automation capabilities in one point-and-click tool. Record-triggered flows can run when records are created, updated, or deleted, and can update records, send notifications, initiate processes, and maintain data consistency.

The “next day” timing points to a scheduled path in a record-triggered flow. Salesforce explains that scheduled paths delay automation for minutes, hours, days, or months after the triggering record change. Salesforce also documents outbound messages as a Flow Builder core action for record-triggered flows, used to send a SOAP message to a designated endpoint.

Approval Process is for approvals, Validation Rule only prevents invalid data, and Assignment Rule is for assigning records such as leads or cases. None of those tools can meet the full requirement.