Exam ASD01 topic 1 question 19 discussion

SanQuest Bank's call center regularly receives requests from customers for the exact amount required to clear their loan. This is a complicated calculation that is prone to human error. The bank has decided to use Blue Prism to perform the calculation and is considering amending its front end system OneBase to allow a user to click a button to request a Loan Consolidation Amount.
They plan to communicate with Blue Prism using web services. Consider the two proposed designs:

Here a Blue Prism object is exposed as a web service. OneBase calls this service providing the account number. The Blue Prism object add the case to a work queue and then returns the Case ID to complete the web service call.
A Blue Prism process works the queue and harvests the data required to perform the calculation. The same Blue Prism process calls a OneBase web service and provides the load settlement figure. OneBase completes the web service call by returning a success flag.

Here the Blue Process that harvests the data is exposed a web service with the loan settlement figure as an output. OneBase calls the web service and provides the account number. The BluePrism process harvests the data and completes the web service call by providing the loan settlement figure.
Considering Blue Prism best practice which of the following statements is correct?