The standard process for a field representative, such as a merchandiser, is to use the Salesforce Mobile App to manage their daily tasks. When arriving at a customer location for a scheduled visit (appointment), the user navigates to the specific Visit record within the app and uses the "Check-In" quick action. This action is specifically designed to capture and record the exact time of arrival and the device's current geo-coordinates, fulfilling the requirements of the inventory-check appointment.

A. Check-in through Einstein Vision: Einstein Vision is used for image recognition tasks like planogram compliance or shelf analysis, not for the primary action of checking into a visit to log time and location.

B. Check-in through standard location picker Lightning Web Component in Salesforce Mobile App: This is overly specific and incorrect. The check-in is a dedicated, pre-built action on the Visit object, not a generic Lightning Web Component that a user would select independently.

D. Check-in through Salesforce Maps on mobile: While Salesforce Maps is used for routing and location intelligence, the core check-in functionality is a standard feature of the Consumer Goods Cloud application on the Salesforce Mobile App and does not require Salesforce Maps.

1. Salesforce Help Documentation, "Execute Visits on the Mobile App": This document explicitly outlines the procedure for field reps. It states, "When a field rep reaches a store, the rep can check in to the store to record the time and location of the visit... From the navigation bar, tap Today's Visits. Tap a visit. Tap Check-In." This confirms the action is performed within the Salesforce Mobile App on the Visit record.

2. Salesforce Help Documentation, "Visit Execution": This section details the lifecycle of a visit, which begins with the check-in process. It describes how the check-in action captures the ActualVisitStartTime and location data, which is fundamental to tracking field rep activity and performance.

3. Trailhead, "Consumer Goods Cloud: Offline Mobile App" Module, "Manage Your Visits" Unit: This educational module describes the capabilities of the mobile app for field reps. It details how reps can "start their day, check in to a store, perform their tasks, and check out," reinforcing that the check-in/check-out process is a core feature of the mobile application experience for visit management.