The quiz question and answer are correct. Step 4 would have the called activity, "CheckInventory" operate on the page noted in that step which is "OrderInfo" page. "Process Order" is the name of the calling activity only. Each step executes in order and if step page field is blank, then and only then the step operation would be on the primary page of the calling activity. Since step 4 specifies a defined page named "OrderInfo" the step Method "Call CheckInventory" would apply to "OrderInfo" page.