A: This describes step-level analytics or funnel analysis, which tracks user progression through the Walk-Thru itself, not the successful completion of the underlying business task.
C: This describes tracking the initiation method (e.g., a Launcher click). While a useful metric, it relates to how a Walk-Thru is started, not its success.
D: This measures the completion of the Walk-Thru content (reaching the last step), which is different from the user successfully completing the actual task the Walk-Thru was guiding.