QUESTION $32$

If a failure occurs after a data change is committed, but before that commit is acknowledged to a client application:

A$.$ the data has not been changed, and the requesting client knows it$.$

B$.$ the data has been changed but the requesting client does not know if the change was completed.

C$.$ the data has been changed and the requesting client knows that the change was completed.

D$.$ the data has not been changed, and the requesting client does not knows if the change was completed.