The File Arrival trigger and Auto Loader perform separate, complementary functions. The trigger monitors the configured storage location and starts the Lakeflow Job after detecting new files. After the notebook starts, Auto Loader examines its own checkpoint and file-tracking state to determine which files have not yet been committed successfully. This separation provides incremental processing and exactly-once ingestion behavior. With availableNow=True, Auto Loader processes all data available when the query starts and then stops, allowing the job compute to terminate and control costs. File Notification mode is not required solely because a File Arrival trigger is used. Disabling checkpoints would remove progress tracking and could cause duplicate processing. The trigger also does not eliminate the need to configure the Auto Loader source path. Therefore, option A is correct.

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